EXECUTION COPY












                                  CREDIT AGREEMENT
                                          
                             Dated as of April 7, 1995
                                          
                                       Among
                                          
                      NATIONAL PATENT DEVELOPMENT CORPORATION,
                                          
                            GENERAL PHYSICS CORPORATION,
                                          
                         INVENTORY MANAGEMENT CORPORATION,
                                          
                        GP ENVIRONMENTAL SERVICES, INC. and
                                          
                   GPS TECHNOLOGIES, INC. FEDERAL SYSTEMS GROUP,
                                          
                                    as Borrowers
                                          
                                        and
                                          
                                 NatWest Bank N.A.
                                          
                                      as Bank
                                          
                                          
                                          





























                                  TABLE OF CONTENTS

                                                                       Page

                                      ARTICLE I

                       DEFINITIONS AND RULES OF INTERPRETATION . . . . .  1

                Section 1.1.    Definitions. . . . . . . . . . . . . . .  1
                Section 1.2.    Rules of Interpretation. . . . . . . . . 15

                                      ARTICLE II

                                THE CREDIT FACILITIES. . . . . . . . . . 16

                Section 2.1.    The Facilities . . . . . . . . . . . . . 16

                                     ARTICLE III

                            AMOUNT AND TERMS OF TERM LOAN. . . . . . . . 17

                Section 3.1.    Commitment to Lend . . . . . . . . . . . 17

                Section 3.2.    Term Note. . . . . . . . . . . . . . . . 17

                Section 3.3.    Procedure for Term Loan Borrowing. . . . 17

                Section 3.4.    Use of Proceeds of the Term Loan . . . . 18

                                      ARTICLE IV

                            THE REVOLVING CREDIT FACILITY. . . . . . . . 18

                Section 4.1.    Commitment to Lend . . . . . . . . . . . 18

                Section 4.2.    Revolving Credit Note. . . . . . . . . . 18

                Section 4.3.    Procedure for Revolving Credit
                                  Borrowing. . . . . . . . . . . . . . . 19

                Section 4.4.    Use of Proceeds of the Revolving
                                  Credit Loans . . . . . . . . . . . . . 19

                                      ARTICLE V

                    INTEREST, CONVERSIONS, PAYMENTS, COSTS, ETC. . . . . 20

                Section 5.1.    Interest . . . . . . . . . . . . . . . . 20
                        5.1.1.  Interest on Loans. . . . . . . . . . . . 20
                        5.1.2.  Interest After Default . . . . . . . . . 20

                Section 5.2.    Reduction of Revolving Credit
                                  Commitments. . . . . . . . . . . . . . 21

                Section 5.3.    Revolving Credit Loan Conversion
                                  Options. . . . . . . . . . . . . . . . 21
                        5.3.1.  Conversion to Different Type of Loan . . 21
                        5.3.2.  Continuation of Type of Loan . . . . . . 21
                        5.3.3.  Deemed Conversion. . . . . . . . . . . . 22

                Section 5.4.    Repayment of the Loans . . . . . . . . . 22
                        5.4.1.  Maturity . . . . . . . . . . . . . . . . 22
                        5.4.2.  Mandatory Repayment of Revolving
                                  Credit Loans . . . . . . . . . . . . . 22
                        5.4.3.  Optional Repayments of Loans . . . . . . 22

                Section 5.5.    Certain Fees and Costs . . . . . . . . . 23
                        5.5.1.  NPDC Closing Fee . . . . . . . . . . . . 23
                        5.5.2.  Commitment Fee . . . . . . . . . . . . . 23
                        5.5.3.  Letter of Credit Fee . . . . . . . . . . 23
                        5.5.4.  Additional Costs, Etc. . . . . . . . . . 23
                        5.5.5.  Capital Adequacy . . . . . . . . . . . . 25
                        5.5.6.  Certificate. . . . . . . . . . . . . . . 25

                Section 5.6.    Payments and Computations. . . . . . . . 26
                        5.6.1.  Funds for Payments . . . . . . . . . . . 26
                                5.6.1.1.  Payment to Bank. . . . . . . . 26
                                5.6.1.2.  No Offset, Etc.  . . . . . . . 26
                        5.6.2.  Computations; Records. . . . . . . . . . 26

                Section 5.7.    Inability to Determine LIBOR Rate. . . . 27

                Section 5.8.    Illegality . . . . . . . . . . . . . . . 27

                Section 5.9.    Indemnity. . . . . . . . . . . . . . . . 27

                Section 5.10.   Concerning Joint and Several
                                  Liability of the GPC Borrowers . . . . 28

                                      ARTICLE VI

                                  LETTERS OF CREDIT. . . . . . . . . . . 30

                Section 6.1.    Letter of Credit Commitment. . . . . . . 30
                        6.1.1.  Commitment to Issue Letters of
                                  Credit . . . . . . . . . . . . . . . . 30
                        6.1.2.  Procedure for Letters of Credit. . . . . 30
                        6.1.3.  Terms of Letters of Credit . . . . . . . 31

                Section 6.2.    Reimbursement Obligation of the
                                  Borrowers. . . . . . . . . . . . . . . 31

                Section 6.3.    Letter of Credit Payments. . . . . . . . 32

                Section 6.4.    Obligations Absolute . . . . . . . . . . 32

                Section 6.5.    Reliance by Issuer . . . . . . . . . . . 33

                Section 6.6.    Letter of Credit Fee . . . . . . . . . . 33

                                     ARTICLE VII

                                 COLLATERAL SECURITY . . . . . . . . . . 33

                Section 7.1.    Security of NPDC . . . . . . . . . . . . 33

                Section 7.2.    Security of GPC Borrowers. . . . . . . . 33

                                     ARTICLE VIII

                            REPRESENTATIONS AND WARRANTIES . . . . . . . 33

                Section 8.1.    Corporate Authority. . . . . . . . . . . 33
                        8.1.1.  Incorporation; Good Standing . . . . . . 33
                        8.1.2.  Authorization. . . . . . . . . . . . . . 34
                        8.1.3.  Enforceability . . . . . . . . . . . . . 34

                Section 8.2.    Governmental and Third Party
                                  Approvals. . . . . . . . . . . . . . . 34

                Section 8.3.    Title to Properties; Leases. . . . . . . 35

                Section 8.4.    Financial Information. . . . . . . . . . 35
                        8.4.1.  Financial Statements . . . . . . . . . . 35
                        8.4.2.  Projections. . . . . . . . . . . . . . . 36

                Section 8.5.    Franchises, Patents, Copyrights,
                                  Etc. . . . . . . . . . . . . . . . . . 36
                Section 8.6.    Litigation . . . . . . . . . . . . . . . 36

                Section 8.7.    No Materially Adverse Contracts,
                                  Etc. . . . . . . . . . . . . . . . . . 36

                Section 8.8.    Compliance With Other Instruments,
                                  Laws, Etc. . . . . . . . . . . . . . . 37

                Section 8.9.    Tax Status . . . . . . . . . . . . . . . 37

                Section 8.10.   No Event of Default. . . . . . . . . . . 37

                Section 8.11.   Holding Company and Investment
                                  Company Acts . . . . . . . . . . . . . 37

                Section 8.12.   Collateral . . . . . . . . . . . . . . . 37

                Section 8.13.   Perfection of Security Interest. . . . . 38

                Section 8.14.   Employee Benefit Plans . . . . . . . . . 38
                        8.14.1. In General . . . . . . . . . . . . . . . 38
                        8.14.2. Terminability of Welfare Plans . . . . . 38
                        8.14.3. Guaranteed Pension Plans . . . . . . . . 39
                        8.14.4. Multiemployer Plan . . . . . . . . . . . 39

                Section 8.15.   Regulations G, U and X . . . . . . . . . 39
                

                Section 8.16.   Environmental Compliance . . . . . . . . 40

                Section 8.17.   Subsidiaries, Etc. . . . . . . . . . . . 41

                Section 8.18.   Capitalization; Ownership of GPC's
                                  Subsidiaries . . . . . . . . . . . . . 42

                Section 8.19.   Disclosure . . . . . . . . . . . . . . . 42

                Section 8.20.   Labor Relations. . . . . . . . . . . . . 42

                                      ARTICLE IX

                        AFFIRMATIVE COVENANTS OF THE BORROWERS . . . . . 42

                Section 9.1.    Punctual Payment . . . . . . . . . . . . 42
                        9.1.1.  NPDC Punctual Payment. . . . . . . . . . 43
                        9.1.2.  Punctual Payments. . . . . . . . . . . . 43

                Section 9.2.    Maintenance of Offices; Names. . . . . . 43

                Section 9.3.    Records and Accounts . . . . . . . . . . 43

                Section 9.4.    Financial Statements, Certificates
                                  and Information. . . . . . . . . . . . 43

                Section 9.5.    Notices. . . . . . . . . . . . . . . . . 46
                        9.5.1.  Defaults . . . . . . . . . . . . . . . . 46
                        9.5.2.  Environmental Events . . . . . . . . . . 46
                        9.5.3.  Notification of Claims Against
                                  Collateral . . . . . . . . . . . . . . 46
                        9.5.4.  Notice of Litigation and Judgments . . . 46
                        9.5.5.  Notice of Amendments to Certain
                                  Documents. . . . . . . . . . . . . . . 47
                        9.5.6.  Notice of Certain Other Events . . . . . 47

                Section 9.6.    Corporate Existence; Maintenance of
                                  Properties . . . . . . . . . . . . . . 47

                Section 9.7.    Insurance. . . . . . . . . . . . . . . . 48
                        9.7.1.  General. . . . . . . . . . . . . . . . . 48
                        9.7.2.  Notice of Cancellation, Etc. . . . . . . 48

                Section 9.8.    Taxes. . . . . . . . . . . . . . . . . . 48

                Section 9.9.    Inspection of Properties and Books,
                                  Etc. . . . . . . . . . . . . . . . . . 49
                        9.9.1.  General. . . . . . . . . . . . . . . . . 49
                        9.9.2.  Bank Audits. . . . . . . . . . . . . . . 49
                        9.9.3.  Communications with Accountants. . . . . 49

                Section 9.10.   Compliance with Laws, Contracts,
                                  Licenses, and Permits. . . . . . . . . 50

                Section 9.11.   Employee Benefit Plans . . . . . . . . . 50

                Section 9.12.   Use of Proceeds. . . . . . . . . . . . . 50

                Section 9.14.   Further Assurances . . . . . . . . . . . 51

                Section 9.15.   Dividend Payments. . . . . . . . . . . . 51

                Section 9.16.   Loans to NPDC and the Foreign
                                  Subsidiaries . . . . . . . . . . . . . 51

                                      ARTICLE X

                   CERTAIN NEGATIVE COVENANTS OF THE GPC BORROWERS . . . 51

                Section 10.1.   Restrictions on Indebtedness . . . . . . 52

                Section 10.2.   Restrictions on Liens. . . . . . . . . . 53

                Section 10.3.   Restrictions on Investments. . . . . . . 54

                Section 10.4.   Distributions. . . . . . . . . . . . . . 55

                Section 10.5.   Merger Consolidation and Disposition
                                  of Assets. . . . . . . . . . . . . . . 55
                        10.5.1. Mergers and Acquisitions . . . . . . . . 55
                        10.5.2. Disposition of Assets. . . . . . . . . . 56

                Section 10.6.   Sale and Leaseback . . . . . . . . . . . 56

                Section 10.7.   Compliance with Environmental Laws . . . 56

                Section 10.8.   Prohibited Changes and Payments. . . . . 56

                Section 10.9.   Employee Benefit Plans . . . . . . . . . 56

                Section 10.10.  Certain Transactions . . . . . . . . . . 57

                Section 10.11.  Limitation on Certain Changes. . . . . . 57

                Section 10.12.  Fiscal Year. . . . . . . . . . . . . . . 58

                Section 10.13.  Ownership of Subsidiaries. . . . . . . . 58

                Section 10.14.  GPC Fixed Charge Coverage. . . . . . . . 58

                Section 10.15.  Capital Expenditures . . . . . . . . . . 58

                Section 10.16.  GPC Consolidated Tangible Net Worth. . . 58

                Section 10.17.  GPC Consolidated Senior Debt to

                                  Consolidated Tangible Net Worth. . . . 58

                Section 10.18.  No GPC Loss. . . . . . . . . . . . . . . 58

                                      ARTICLE XI

                          CERTAIN NEGATIVE COVENANTS OF NPDC . . . . . . 59

                Section 11.1.   Restrictions on Liens. . . . . . . . . . 59

                Section 11.2.   Restrictions on Guaranties . . . . . . . 59

                Section 11.3.   Mergers and Acquisitions . . . . . . . . 60

                Section 11.4.   Certain Transactions . . . . . . . . . . 60

                Section 11.5.   Fiscal Year. . . . . . . . . . . . . . . 61

                Section 11.6.   Ownership of Subsidiaries. . . . . . . . 61

                Section 11.8.   NPDC Collateral to Loan Ratio. . . . . . 61

                Section 11.9.   NPDC Collateral Cash Flow Coverage . . . 61

                Section 11.10.  NPDC Leverage Ratio. . . . . . . . . . . 62

                                     ARTICLE XII

                                  CLOSING CONDITIONS . . . . . . . . . . 62

                Section 12.1.   Loan Documents . . . . . . . . . . . . . 62
                        12.1.1. Loan Documents . . . . . . . . . . . . . 62
                        12.1.2. Subordination Documents. . . . . . . . . 62

                Section 12.2.   Certified Copies of Charter
                                  Documents; Good Standing 
                                  Certificates . . . . . . . . . . . . . 62

                Section 12.3.   Corporate Action . . . . . . . . . . . . 63

                Section 12.4.   Incumbency Certificate . . . . . . . . . 63

                Section 12.5.   Validity of Liens. . . . . . . . . . . . 63

                Section 12.6.   Lien Search Results. . . . . . . . . . . 63

                Section 12.7.   Evidence of Security Interests . . . . . 64

                Section 12.8.   Borrowing Base Report. . . . . . . . . . 64

                Section 12.9.   Opinions of Counsel. . . . . . . . . . . 64

                Section 12.10.  Payment of Fees and Expenses . . . . . . 64

                Section 12.11.  Payoff Letter. . . . . . . . . . . . . . 64

                Section 12.12.  Disbursement Instructions. . . . . . . . 64

                Section 12.13.  No Material Changes, Etc.  . . . . . . . 65

                Section 12.14.  Representations True; No Default . . . . 65

                Section 12.15.  Capital Structure. . . . . . . . . . . . 65

                Section 12.16.  Legal Restrictions . . . . . . . . . . . 65

                Section 12.18.  Due Diligence. . . . . . . . . . . . . . 65

                Section 12.19.  Satisfactory Documentation . . . . . . . 66

                                     ARTICLE XIII

                             CONDITIONS TO ALL BORROWINGS. . . . . . . . 66

                Section 13.1.   Representations True; No Event of
                                  Default. . . . . . . . . . . . . . . . 66

                Section 13.2.   No Legal Impediment. . . . . . . . . . . 66

                Section 13.3.   Governmental Regulation. . . . . . . . . 66

                Section 13.4.   Proceedings and Documents. . . . . . . . 66

                Section 13.5.   Borrowing Base Report. . . . . . . . . . 67

                Section 13.6.   Sufficient Credit Availability . . . . . 67

                                     ARTICLE XIV

                        EVENTS OF DEFAULT; ACCELERATION; ETC.  . . . . . 67

                Section 14.1.   Events of Default and Acceleration . . . 67

                Section 14.2.   Termination of Commitment. . . . . . . . 71

                Section 14.3.   Remedies . . . . . . . . . . . . . . . . 71

                Section 14.4.   Setoff . . . . . . . . . . . . . . . . . 72

                Section 14.5.   Waiver . . . . . . . . . . . . . . . . . 72

                                      ARTICLE XV

                          PROVISIONS OF GENERAL APPLICATION. . . . . . . 72

                Section 15.1.   Expenses . . . . . . . . . . . . . . . . 72

                Section 15.2.   Indemnification. . . . . . . . . . . . . 73

                Section 15.3.   Survival of Covenants, Etc.  . . . . . . 75

                Section 15.4.   Assignment and Participation . . . . . . 75
                        15.4.1. No Assignments by Borrowers. . . . . . . 75
                        15.4.2. Assignments and Participations . . . . . 75
                        15.4.3. Disclosure . . . . . . . . . . . . . . . 76

                Section 15.5.   Notices, Etc.  . . . . . . . . . . . . . 76

                Section 15.6.   Governing Law; Jurisdiction and
                                  Venue. . . . . . . . . . . . . . . . . 77

                Section 15.7.   Acknowledgements . . . . . . . . . . . . 77

                Section 15.8.   WAIVER OF JURY TRIAL . . . . . . . . . . 78

                Section 15.9.   Headings . . . . . . . . . . . . . . . . 78

                Section 15.10.  Counterparts . . . . . . . . . . . . . . 78

                Section 15.11.  Entire Agreement, Etc. . . . . . . . . . 78

                Section 15.12.  Consents, Amendments, Waivers, Etc.  . . 78

                Section 15.13.  Severability . . . . . . . . . . . . . . 79

                Section 15.14.  Integration of Exhibits and
                                  Schedules. . . . . . . . . . . . . . . 79

                Section 15.15.  Confidentiality. . . . . . . . . . . . . 79



          EXHIBITS AND SCHEDULES

          Exhibit A-1         Form of Term Note
          Exhibit A-2         Form of Revolving Credit Note
          Exhibit A-3         Form of Subordinated Pledged Note
          Exhibit B           Form of Security Agreement
          Exhibit C           Form of GPC Note Pledge Agreement
          Exhibit D           Form of Pledge Agreement
          Exhibit E-1         Form of Loan Request
          Exhibit E-2         Form of Term Loan Request
          Exhibit F           Form of Borrowing Base Report
          Exhibit G           Intentionally Omitted
          Exhibit H-1         Form of Compliance Certificate
          Exhibit H-2         Form of NPDC Compliance Certificate
          Exhibit I           Intentionally Omitted
          Exhibit J           Form of Subordination and Intercreditor       
                         Agreement

          Schedule 8.2        UCC-1 Financing Statements and UCC-3          
                    Termination Statements
          Schedule 8.3        Title Exceptions
          Schedule 8.6        Litigation
          Schedule 8.12(a)    Offices, Etc.
          Schedule 8.12(c)    Trade Names, Etc.
          Schedule 8.14       Guaranteed Pension Plans
          Schedule 8.16       Environmental Compliance
          Schedule 8.17       Subsidiaries and GPC Borrower Joint Ventures
          Schedule 8.18       Capitalization
          Schedule 10.1(i)    Existing Indebtedness
          Schedule 10.1(n)    Joint Venture Indebtedness
          Schedule 10.2       Existing Liens
          Schedule 10.3(d)    Existing Investments
          Schedule 10.3(h)    Stock Exchange and Joint Venture Investments
          Schedule 10.10      Certain Transactions with Affiliates
                              Schedule 11.2       Guaranties

                                   CREDIT AGREEMENT


                    This CREDIT AGREEMENT is made as of the 7th day of
          April, 1995, by and among NATIONAL PATENT DEVELOPMENT CORPORATION
          ("NPDC"), a Delaware corporation having its principal place of
          business at 9 West 57th Street, New York, New York  10019,
          GENERAL PHYSICS CORPORATION ("GPC"), a Delaware corporation
          having its principal place of business at 6700 Alexander Bell
          Drive, Columbia, Maryland 21046, INVENTORY MANAGEMENT CORPORATION
          ("IMC"), a Maryland corporation having its principal place of
          business at 6700 Alexander Bell Drive, Columbia, Maryland 21046,
          GP ENVIRONMENTAL SERVICES, INC. ("GPESI"), a Delaware corporation
          having its principal place of business at 6700 Alexander Bell
          Drive, Columbia, Maryland 21046, GPS TECHNOLOGIES, INC. FEDERAL
          SYSTEMS GROUP ("GPSTI", and collectively with GPC, IMC and GPESI
          the "GPC Borrowers"), a Delaware corporation having its principal
          place of business at 6700 Alexander Bell Drive, Columbia,
          Maryland 21046 and NATWEST BANK N.A. (the "Bank"), a national
          banking association.

                    The parties hereto hereby agree as follows:


                                      ARTICLE I

                       DEFINITIONS AND RULES OF INTERPRETATION

                    Section 1.1.  Definitions.  The following terms shall
          have the meanings set forth in this Article I or elsewhere in the
          provisions of this Credit Agreement referred to below:

                    Accounts Receivable.  All rights of the GPC Borrowers
          to payment for goods sold, leased or otherwise marketed in the
          ordinary course of business and all rights of the GPC Borrowers
          to payment for services rendered in the ordinary course of
          business and all sums of money or other proceeds due thereon
          pursuant to transactions with account debtors, except for that
          portion of the sum of money or other proceeds due thereon that
          relate to sales, use or property taxes in conjunction with such
          transactions, recorded on books of account in accordance with
          generally accepted accounting principles and including, without
          limitation, "accounts" as defined in the Uniform Commercial Code
          of any applicable or relevant jurisdiction and Government
          Receivables. 

                    Affiliate.  As to any Person, any other Person (other
          than a wholly-owned Subsidiary) which, directly or indirectly, is
          in control of, is controlled by, or is under common control with,
          such Person.

                    Applicable Law.  Statutes and rules and regulations
          thereunder and interpretations thereof by any competent court or
          by any governmental or other regulatory body or official charged
          with the administration or the interpretation thereof and all
          policies, guidelines, requests, directives, instructions and
          notices at any time or from time to time hereafter made upon or
          otherwise issued (whether or not having the force of law).

                    Available Credit.  The lesser of (a) the Revolving
          Credit Commitment or (b) the Borrowing Base Amount, as each may
          be in existence from time to time, as such lesser amount is
          reduced by the sum of (x) the aggregate amount of all outstanding
          Revolving Credit Loans, (y) the aggregate amount of (i) the
          Maximum Drawing Amount of all outstanding Letters of Credit and
          (ii) all Reimbursement Obligations and (z) the amount of all
          other GPC Obligations arising from or in respect of the Loan
          Documents that are then due and payable.

                    Balance Sheet Date.  September 30, 1994.

                    Bank:  As defined in the preamble hereto.

                    Bank's Office.  The Bank's office located at Exchange
          Place Centre, 10 Exchange Place, Jersey City, New Jersey 07302,
          or at such other location as the Bank may designate from time to
          time.

                    Bank's Special Counsel.  Simpson Thacher & Bartlett or
          such other counsel as may be approved by the Bank.

                    Borrowers.  The collective reference to NPDC and the
          GPC Borrowers.

                    Borrowing Base Amount.  At the relevant time of
          reference thereto, an amount determined by the Bank by reference
          to the most recent Borrowing Base Report equal to eighty percent
          (80%) of Eligible Accounts Receivable.  The Borrowing Base Amount
          shall be determined monthly (or at such other interval as may be
          specified pursuant to Section 9.4(f)) by the Bank by reference to
          the Borrowing Base Report delivered to the Bank pursuant to
          Section 9.4(f).

                    Borrowing Base Report.  A Borrowing Base Report signed
          by the chief financial officer of GPC and in substantially the
          form of Exhibit F hereto.

                    Business Day.  Any day other than a Saturday, Sunday or
          day on which commercial banking institutions in New York, New
          York are authorized or required by law to be closed.

                    Capital Assets.  As to any Person as of the date of
          determination thereof, fixed assets, both tangible (such as land,
          buildings, fixtures, machinery and equipment) and intangible
          (such as patents, copyrights, trademarks, franchises and good
          will); provided that Capital Assets shall not include any item
          customarily charged directly to expense or depreciated over a
          useful life of twelve (12) months or less in accordance with
          generally accepted accounting principles.

                    Capital Expenditures.  As to any Person for any fiscal
          period, amounts paid or indebtedness incurred by such Person or
          any of its Subsidiaries in connection with the purchase or lease
          by such Person or any of its Subsidiaries of Capital Assets that
          would be required to be capitalized and shown on the balance
          sheet of such Person in accordance with generally accepted
          accounting principles.

                    Capitalized Leases.  As to any Person as of the date of
          determination thereof, leases under which such Person or any of
          its Subsidiaries is the lessee or obligor, the discounted future
          rental payment obligations under which are required to be
          capitalized on the balance sheet of the lessee or obligor in
          accordance with generally accepted accounting principles.

                    CERCLA.  As defined in Section 8.16(a).

                    Closing Date.  The first date on which the conditions
          set forth in Article XII have been satisfied and any Loans are to
          be made or any Letter of Credit is to be issued hereunder.

                    Code.  The Internal Revenue Code of 1986.  

                    Collateral.  The collective reference to the GPC
          Collateral and the NPDC Collateral.

                    Consolidated or consolidated.  With reference to any
          term defined herein, shall mean that term as applied to the
          accounts of GPC and its Subsidiaries or NPDC and its
          Subsidiaries, as the case may be, to the extent they are or
          should be consolidated in accordance with generally accepted
          accounting principles.

                    Consolidated EBITDA.  As to any Person for any period,
          the Consolidated Net Income of such Person plus, but only to the
          extent such items shall have been deducted in determining such
          Consolidated Net Income, the sum of: (i) Consolidated Total
          Interest Expense, (ii) depreciation and amortization of assets,
          (iii) federal, state and local taxes; and minus, but only to the
          extent such item shall have been included in determining
          Consolidated Net Income, interest income accrued but unpaid
          during such period in favor of such Person consisting of interest
          on Indebtedness of NPDC owing to such Person, whether such
          Indebtedness is evidenced by notes or other evidences of
          Indebtedness pledged to the Bank pursuant hereto, or otherwise;
          determined in each case on a consolidated basis in accordance
          with generally accepted accounting principles.

                    Consolidated Fixed Charges.  As to any Person for any
          period, an amount equal to the sum of (i) all payments on
          Indebtedness that became due and payable during such fiscal year
          pursuant to any agreement or instrument to which such Person or
          any of its Subsidiaries is a party relating to the borrowing of
          money or the obtaining of credit or in respect of Capitalized
          Leases, including, without limitation, all principal payments and
          Consolidated Total Interest Expense for such period and (ii) all
          payments by such Person during such period on all leases (other
          than operating leases that are not Capitalized Leases) of real
          and personal property (without duplication of items in (i)
          above).  Demand obligations shall be deemed to be due and payable
          during any fiscal year during which such obligations are
          outstanding. 

                    Consolidated Net Income (or Deficits).  As to any
          Person for any fiscal period, the consolidated net income (or
          deficit) of such Person and its Subsidiaries, after deduction of
          all expenses, taxes, and other proper charges, determined in
          accordance with generally accepted accounting principles.

                    Consolidated Senior Debt.  As to any Person as of the
          date of determination thereof, Consolidated Total Liabilities of
          such Person excluding Subordinated Debt.

                    Consolidated Tangible Net Worth.  As to any Person as
          of the date of determination thereof, the excess of Consolidated
          Total Assets over Consolidated Total Liabilities (exclusive of
          Subordinated Debt), and less the sum of (without duplication):

                         (a)  the total book value of all assets of such
               Person and its Subsidiaries properly classified as
               intangible assets under generally accepted accounting
               principles, including such items as good will, the purchase
               price of acquired assets in excess of the fair market value
               thereof, trademarks, trade names, service marks, brand
               names, copyrights, patents and licenses, and rights with
               respect to the foregoing; plus

                         (b)  all amounts representing any write-up in the
               book value of any assets of such Person or its Subsidiaries
               resulting from a revaluation thereof subsequent to the
               Balance Sheet Date; plus

                         (c)  to the extent otherwise includable in the
               computation of Consolidated Tangible Net Worth, any
               subscriptions receivable.

                    Consolidated Total Assets.  As to any Person as of the
          date of determination thereof, all assets of such Person and its
          Subsidiaries determined on a consolidated basis in accordance
          with generally accepted accounting principles.

                    Consolidated Total Interest Expense.  As to any Person
          for any period, the aggregate amount of interest required to be
          paid or accrued by such Person and its Subsidiaries during such
          period on all Indebtedness of such Person and its Subsidiaries
          outstanding during all or any part of such period, whether such
          interest was or is required to be reflected as an item of expense
          or capitalized, including payments consisting of interest in
          respect of Capitalized Leases and including commitment fees,
          facility fees and similar fees or expenses in connection with the
          borrowing of money.

                    Consolidated Total Liabilities.  As to any Person as of
          the date of determination thereof, all liabilities that would
          appear on the balance sheet of such Person and its Subsidiaries
          determined on a consolidated basis in accordance with generally
          accepted accounting principles.  

                    Conversion Request.  A notice given by the GPC
          Borrowers to the Bank of the GPC Borrowers' election to convert
          or continue a Revolving Credit Loan in accordance with Section
          5.3.

                    Credit Agreement.  This Credit Agreement, including the
          Schedules and Exhibits hereto.

                    Default.  As defined in Section 14.1.

                    Distribution.  As to any Person the declaration or
          payment of any dividend on or in respect of any shares of any
          class of capital stock of such Person, other than dividends
          payable solely in shares of common stock of such Person; the
          purchase, redemption, or other retirement of any shares of any
          class of capital stock of such Person, directly or indirectly
          through a Subsidiary of such Person, or otherwise; the return of
          capital by such Person to its shareholders as such; or any other
          distribution on or in respect of any shares of any class of
          capital stock of such Person.

                    Dollars or $.  Dollars in lawful currency of the United
          States of America.

                    Drawdown Date.  The date on which any Loan is made or
          is to be made, and the date on which any Revolving Credit Loan is
          converted or continued in accordance with Section 5.3.

                    Eligible Accounts Receivable.  The aggregate of the
          unpaid portions of Accounts Receivable (net of any credits,
          rebates, offsets, holdbacks or other adjustments or commissions
          payable to third parties that are adjustments to such Accounts
          Receivable) (a) that GPC reasonably and in good faith determines
          to be collectible; (b) that are with account debtors that (i) are
          not Affiliates of GPC, (ii) purchased the goods or services
          giving rise to the relevant Account Receivable in an arm's length
          transaction conducted in the ordinary course of business, (iii)
          are not insolvent or involved, whether voluntary or involuntary,
          in any case or proceeding under any bankruptcy, reorganization,
          arrangement, insolvency, adjustment of debt, dissolution,
          liquidation or similar law of any jurisdiction and (iv) are, in
          the Bank's reasonable judgment, creditworthy; (c) that are in
          payment for goods actually delivered or services or obligations
          that have been fully performed; provided, that with respect to
          Accounts Receivable subject to dispute or any other similar
          claims that would reduce the cash amount payable therefor, the
          amount hereunder shall be reduced by the cash amount in dispute,
          except that no value shall be given hereunder to any Account
          Receivable under which the cash amount payable therefor equals or
          exceeds $200,000, if twenty-five percent (25%) or more of the
          cash amount payable therefor is in dispute; (d) that are not
          subject to any pledge, restriction, security interest or other
          lien or encumbrance other than those created by the Loan
          Documents and except for Liens permitted under Sections 10.2(ii)
          and 10.2(iv) which attach to the general assets (including
          Accounts Receivable) of any of the GPC Borrowers; provided, that
          the amount hereunder shall be reduced by the amount of any such
          Lien (without duplication of reductions pursuant to paragraph (e)
          below); (e) in which the Bank has a valid and perfected first
          priority security interest and except for Liens permitted under
          Sections 10.2(ii) and 10.2(iv) which attach to the general assets
          (including Accounts Receivable) of any of the GPC Borrowers;
          provided, that the amount hereunder shall be reduced by the
          amount of any such Lien (without duplication of reductions
          pursuant to paragraph (d) above); (f) that are not outstanding
          for more than ninety (90) days past the date of the respective
          invoices therefor; (g) that are not due from any single account
          debtor if more than fifty percent (50%) of the aggregate amount
          of all Accounts Receivable owing from such account debtor would
          otherwise not be Eligible Accounts Receivable; (h) that are
          payable in Dollars; (i) that are not payable from an office
          outside of the United States unless they are subject to letter of
          credit support reasonably acceptable to the Bank; (j) with
          respect to Government Receivables, to the extent the GPC
          Borrowers have complied with the provisions of the Security
          Agreement relating thereto; and (k) to the extent that the
          aggregate amount owing by a single account debtor (other than the
          United States government) on all such Accounts Receivable exceeds
          twenty-five percent (25%) of the Eligible Accounts Receivable of
          all account debtors, exclusive of such excess unless such excess
          has been accepted by the Bank as being eligible, acting in its
          exclusive and uncontrolled discretion.

                    Employee Benefit Plan.  Any employee benefit plan
          within the meaning of Section 3(3) of ERISA maintained or
          contributed to by any Borrower or any ERISA Affiliate, other than
          a Multiemployer Plan.

                    Employment Litigation.  That certain litigation known
          as Edwin P. Harrison v. General Physics Corporation (Court of
          Common Pleas, Aiken County, South Carolina, Civil Action No.
          93-CP-02-949); Donita L. Harrison v. General Physics Corporation
          (Court of Common Pleas, Aiken County, South Carolina, Civil
          Action No. 93-CP-02-766); and Edwin P. Harrison v. General
          Physics Corporation (Charge No. 146930477, Equal Employment
          Opportunity Commission).

                    Environmental Laws.  As defined in Section 8.16(a).

                    ERISA.  The Employee Retirement Income Security Act of
          1974.

                    ERISA Affiliate.  Any Person that is treated as a
          single employer with any of the Borrowers under Section 414 of
          the Code.

                    ERISA Reportable Event.  A reportable event with
          respect to a Guaranteed Pension Plan within the meaning of
          Section 4043 of ERISA and the regulations promulgated thereunder
          as to which the requirement of notice has not been waived.

                    Event of Default.  As defined in Section 14.1.

                    Five Star.  Five Star Group, Inc., a Delaware
          corporation.

                    Five Star Agreement.  The Loan Agreement, dated
          April 29, 1993, among Five Star, the lenders signatory thereto
          and the Bank, as Agent for the lenders and any other agreement
          evidencing any obligation (direct or indirect) for borrowed money
          or guarantees of the foregoing between Five Star and the Bank.

                    Foreign Subsidiaries.  Collectively, General Physics
          Asia Pte. Ltd., a Singapore private company having its principal
          place of business at 80 Marine Parade Road, 11-01 Parkway Parade,
          Singapore, 1544 and General Physics (Malaysia) Sdn. Bhn., a
          Malaysian private company having its principal place of business
          at B2-2 and B2-3, Block B, Bangunan SPKR, 46 Jalan Bungun,
          Damansara Heights, Malaysia 50490.

                    Foreign Subsidiaries Pledged Note.  A promissory note,
          in form and substance satisfactory to the Bank, made by the
          Foreign Subsidiaries to the order of GPC and pledged to the Bank
          pursuant to the GPC Note Pledge Agreement.

                    generally accepted accounting principles.  Generally
          accepted accounting principles in the United States of America in
          effect from time to time.

                    Government Receivables.  All rights of the GPC
          Borrowers to moneys due or to become due under any contracts or
          agreements with or orders from the United States government or
          any agency or department thereof.

                    GPC.  As defined in the preamble hereto.

                    GPC Collateral.  All the property, rights and interests
          of the GPC Borrowers that are or are intended to be subject to
          the security interests created by the Security Agreements, the
          GPC Note Pledge Agreement and any cash collateral paid to the
          Bank pursuant to Sections 6.2(b) or (c).

                    GPC Compliance Certificate.  As defined in Section
          9.4(e).   

                    GPC Note Pledge Agreement.  The GPC Note Pledge
          Agreement dated as of the date hereof between GPC and the Bank
          and substantially in the form of Exhibit C.

                    GPC Obligations.  All indebtedness, obligations and
          liabilities of the GPC Borrowers to the Bank, existing on the
          date of this Credit Agreement or arising thereafter, direct or
          indirect, joint or several, absolute or contingent, matured or
          unmatured, liquidated or unliquidated, secured or unsecured,
          arising by contract, operation of law or otherwise, but only
          those arising or incurred under or arising in respect of this
          Credit Agreement or any of the other Loan Documents or in respect
          of any of the Revolving Credit Loans made or Reimbursement
          Obligations incurred or the Revolving Credit Note or any of the
          Letter of Credit Applications, Letters of Credit or other
          instruments at any time evidencing any thereof.

                    GPESI.  As defined in the preamble hereto.

                    GPSTI.  As defined in the preamble hereto.

                    Guaranteed Pension Plan.  Any employee pension benefit
          plan within the meaning of Section 3(2) of ERISA maintained or
          contributed to by any Borrower or any ERISA Affiliate the
          benefits of which are guaranteed on termination in full or in
          part by the PBGC pursuant to Title IV of ERISA, other than a
          Multiemployer Plan.

                    Hazardous Substances.  As defined in Section 8.16(b).

                    IMC.  As defined in the preamble hereto.

                    Indebtedness.  Without duplication, all obligations,
          contingent and otherwise, that in accordance with generally
          accepted accounting principles should be classified upon the
          obligor's balance sheet as liabilities, including in any event
          and whether or not so classified: (a) all debt and similar
          monetary obligations, whether direct or indirect; (b) all
          liabilities secured by any mortgage, pledge, security interest,
          lien, charge or other encumbrance existing on property owned or
          acquired subject thereto, whether or not the liability secured
          thereby shall have been assumed; (c) obligations under all
          Capitalized Leases and (d) all guarantees, endorsements and other
          contingent obligations whether direct or indirect in respect of
          indebtedness of others, including any obligation to supply funds
          to or in any manner to invest in, directly or indirectly, the
          debtor, to purchase indebtedness, or to assure the owner of
          indebtedness against loss, through an agreement to purchase
          goods, supplies, or services in each case for the purpose of
          enabling the debtor to make payment of the indebtedness held by
          such owner or otherwise, and the obligations to reimburse the
          issuer in respect of any letters of credit.

                    Indenture.  The Indenture, dated as of August 31, 1994,
          between GPC and Bank of Montreal Trust Company, as amended,
          supplemented or otherwise modified from time to time.

                    Interest Payment Date.  (a) As to any Prime Rate Loan,
          the last day of each calendar month to occur while such Loan is
          outstanding, (b) as to any LIBOR Rate Loan, each day which is one
          month or a whole multiple thereof after the first day of such
          Interest Period and the last day of such Interest Period and (c)
          as to any Loan, whenever any payment is made in respect of such
          Loan.

                    Interest Period.  With respect to any LIBOR Rate Loan:

                         (a)  initially, the period commencing on the
                    Drawdown Date with respect to such LIBOR Rate Loan and
                    ending one, two, three or six months thereafter, as
                    selected by the Borrower thereof in its notice of
                    borrowing or notice of conversion, as the case may be,
                    given with respect thereto; and

                         (b)  thereafter, each period commencing on the
                    last day of the next preceding Interest Period
                    applicable to such LIBOR Rate Loan and ending one, two,
                    three or six months thereafter, as selected by the
                    Borrower thereof by irrevocable notice to the Bank not
                    less than three Business Days prior to the last day of
                    the then current Interest Period with respect thereto;

               provided that, all of the foregoing provisions relating to
               Interest Periods are subject to the following:

                         (1)  if any Interest Period would otherwise end on
                    a day that is not a LIBOR Business Day, such Interest
                    Period shall be extended to the next succeeding LIBOR
                    Business Day unless the result of such extension would
                    be to carry such Interest Period into another calendar
                    month in which event such Interest Period shall end on
                    the immediately preceding LIBOR Business Day;

                         (2)  any Interest Period that would otherwise
                    extend beyond the Revolving Credit Maturity Date shall
                    end on the Revolving Credit Maturity Date;

                         (3)  any Interest Period that begins on the last
                    LIBOR Business Day of a calendar month (or on a day for
                    which there is no numerically corresponding day in the
                    calendar month at the end of such Interest Period)
                    shall end on the last LIBOR Business Day of a calendar
                    month; and

                         (4)  the Borrower shall select Interest Periods so
                    as not to require a payment or prepayment of any LIBOR
                    Rate Loan during an Interest Period for such Loan.

                    Investments.  Without duplication, all expenditures
          made and all liabilities incurred (contingently or otherwise) for
          the acquisition of stock or Indebtedness of, or for loans,
          advances, capital contributions (including, without limitation,
          in the form of transfers of property), or in respect of any
          guaranties (or other commitments as described under
          Indebtedness), or obligations of, any Person, provided, that the
          foregoing shall exclude trade credit extended in the ordinary
          course of business. In determining the aggregate amount of
          Investments outstanding at any particular time: (a) the amount of
          any Investment represented by a guaranty shall be taken at not
          less than the principal amount of the obligations guaranteed and
          still outstanding; (b) there shall be included as an Investment
          all interest accrued with respect to Indebtedness constituting an
          Investment unless and until such interest is paid; (c) there
          shall be deducted in respect of each such Investment any amount
          received as a return of capital (but only by repurchase,
          redemption, retirement, repayment, liquidating dividend or
          liquidating distribution); (d) there shall not be deducted in
          respect of any Investment any amounts received as earnings on
          such Investment, whether as dividends, interest or otherwise,
          except that accrued interest included as provided in the
          foregoing clause (b) may be deducted when paid; and (e) there
          shall not be deducted from the aggregate amount of Investments
          any decrease in the value thereof.

                    Joint Venture.  The Combat System Development
          Associates Joint Venture, formed March 11, 1994, among EG&G
          Washington Analytical Center, Inc. and GPSTI.

                    Letter of Credit.  As defined in Section 6.1.1.

                    Letter of Credit Application.  As defined in Section
          6.1.1.

                    LIBOR Base Rate.  With respect to each day during each
          Interest Period pertaining to a LIBOR Rate Loan, the rate per
          annum equal to the rate at which the Bank is offered Dollar
          deposits at or about 10:00 A.M., New York City time, two LIBOR
          Business Days prior to the beginning of such Interest Period in
          the interbank eurodollar market where the eurodollar operations
          in respect of its LIBOR Rate Loans are then being conducted for
          delivery on the first day of such Interest Period for the number
          of days comprised therein and in an amount comparable to the
          amount of its LIBOR Rate Loan to be outstanding during such
          Interest Period.

                    LIBOR Business Day.  Any Business Day on which
          commercial banks are open for international business (including
          dealings in Dollar deposits) in London or such other Dollar
          interbank market as may be selected by the Bank in its sole
          discretion acting in good faith.

                    LIBOR Rate.  With respect to each day during each
          Interest Period pertaining to a LIBOR Rate Loan, a rate per annum
          determined for such day in accordance with the following formula
          (rounded upward to the nearest 1/100th of 1%):

                                   LIBOR Base Rate        
                       1.00 - LIBOR Reserve Requirements

                    LIBOR Rate Loans.  Revolving Credit Loans bearing
          interest calculated by reference to the LIBOR Rate.

                    LIBOR Reserve Requirements.  For any day as applied to
          a LIBOR Rate Loan, the aggregate (without duplication) of the
          rates (expressed as a decimal fraction) of reserve requirements
          in effect on such day (including, without limitation, basic,
          supplemental, marginal and emergency reserves under any
          regulations of the Board of Governors of the Federal Reserve
          System or other governmental authority having jurisdiction with
          respect thereto) dealing with reserve requirements prescribed for
          eurocurrency funding (currently referred to as "Eurocurrency
          Liabilities" in Regulation D of such Board) maintained by a
          member bank of such System.

                    Lien.  Any mortgage, deed of trust, pledge, security
          interest, encumbrance, lien or charge of any kind (including any
          agreement to give any of the foregoing), any conditional sale or
          other title retention agreement, any lease in the nature of any
          of the foregoing and the filing of or agreement to give any
          financing statement (other than any financing statement in
          connection with a "true" lease that is not a Capitalized Lease)
          under the Uniform Commercial Code of any jurisdiction.

                    Loan Documents.  This Credit Agreement, the Term Note,
          the Revolving Credit Note, the Letter of Credit Applications, the
          Letters of Credit, the NPDC Subordinated Pledged Note, the
          Subordination and Intercreditor Agreement and the Security
          Documents.

                    Loan Request.  As defined in Section 4.3.

                    Loan.  Any loan made or to be made by the Bank to the
          Borrowers pursuant to this Credit Agreement.

                    Materially Adverse Effect.  A materially adverse effect
          on the business, condition (financial or otherwise), operations,
          performance or properties of the GPC Borrowers taken as a whole
          or NPDC and its Subsidiaries taken as a whole.

                    Maximum Drawing Amount.  The maximum aggregate amount
          from time to time that the beneficiaries may draw under
          outstanding Letters of Credit, as such aggregate amount may be
          reduced from time to time pursuant to the terms of the Letters of
          Credit.

                    Multiemployer Plan.  Any multiemployer plan within the
          meaning of Section 3(37) of ERISA maintained or contributed to by
          the Borrowers or any ERISA Affiliate.

                    Note Record.  The grid attached to and constituting a
          part of the Term Note or the Revolving Credit Note, as the case
          may be, or the continuation of such grid, or any other similar
          record, including computer records, maintained by the Bank with
          respect to any Loan referred to in such Note.

                    MXL.  MXL Industries, Inc., a Delaware corporation.

                    MXL Agreement.  The Loan Agreement, dated April 29,
          1993, among MXL, the lenders signatory thereto and the Bank, as
          Agent for the lenders and any other agreement evidencing any
          obligation (direct or indirect) for borrowed money or guarantees
          of the foregoing between MXL and the Bank.

                    NPDC.  As defined in the preamble hereto.

                    NPDC Collateral.  All the property, rights and
          interests of NPDC that are or are intended to be subject to the
          security interest created by the Pledge Agreement and the Cash
          Collateral Agreement.

                    NPDC Collateral Cash Flow.  For any period, an amount
          equal to the sum of the cash interest and principal payments on
          the Pledged Debentures received by NPDC and the cash dividend
          payments received by NPDC on the common stock of GPC pledged
          under the Pledge Agreement.

                    NPDC Compliance Certificate.  As defined in Section
          9.4(e).

                    NPDC Obligations.  All indebtedness, obligations and
          liabilities of NPDC to the Bank, existing on the date of this
          Credit Agreement or arising thereafter, direct or indirect,
          absolute or contingent, matured or unmatured, liquidated or
          unliquidated, secured or unsecured, arising by contract,
          operation of law or otherwise, but only those arising or incurred
          under or arising in respect of this Credit Agreement or any of
          the other Loan Documents or in respect of the Term Loan or the
          Term Note or other instruments at any time evidencing any
          thereof.

                    NPDC Subordinated Pledged Note. The promissory note,
          substantially in the Form of Exhibit A-3 hereto, made by NPDC to
          the order of GPC and pledged to the Bank pursuant to the GPC Note
          Pledge Agreement.

                    Obligations.  The collective reference to the GPC
          Obligations and the NPDC Obligations.

                    outstanding.  With respect to the Loans, the aggregate
          unpaid principal thereof as of any date of determination.

                    Overdue Rate.  As defined in Section 5.1.2

                    Payment Date.  As defined in Section 3.2.

                    PBGC.  The Pension Benefit Guaranty Corporation created
          by Section 4002 of ERISA and any successor entity or entities
          having similar responsibilities.

                    Permitted Liens.  Liens, security interests and other
          encumbrances permitted by Section 10.2, in the case of the GPC
          Borrowers, and Section 11.1, in the case of NPDC.

                    Person.  Any individual, corporation, partnership,
          trust, unincorporated association, business, or other legal
          entity, and any government or any governmental agency or
          political subdivision thereof.

                    Pledge Agreement.  The Pledge Agreement dated as of the
          date hereof between NPDC and the Bank and substantially in the
          form of Exhibit D hereto.

                    Pledged Debentures.  The Debentures (as defined in the
          Indenture) of which NPDC is a Holder (as defined in the
          Indenture) and which NPDC has pledged to the Bank pursuant to the
          Pledge Agreement.

                    Prime Rate.  The interest rate established from time to
          time by the Bank as its prime rate at its principal office in New
          York City.  Notwithstanding the foregoing, the Borrowers
          acknowledge that the Bank may regularly make domestic commercial
          loans at rates of interest less than the rate of interest
          referred to in the preceding sentence.  Each change in any
          interest rate provided for herein based upon the Prime Rate
          resulting from a change in the Prime Rate shall take effect as of
          the opening of business on the effective day of such change in
          the Prime Rate.

                    Prime Rate Loans.  Loans bearing interest calculated by
          reference to the Prime Rate.

                    Prime Rate Revolving Credit Loans.  Revolving Credit
          Loans bearing interest calculated by reference to the Prime Rate.

                    Real Estate.  All real property at any time owned or
          leased (as lessee or sublessee) by the Borrowers.
           
                    Reimbursement Obligation.  The GPC Borrowers' joint and
          several obligation to reimburse the Bank on account of any
          drawing under, or any other amount payable under or in respect
          of, any Letter of Credit as provided in Section 6.2.  This term
          includes, but is not limited to, Unpaid Reimbursement
          Obligations.

                    Revolving Credit Commitment.  As defined in Section
          2.1.

                    Revolving Credit Loans.  As defined in Section 4.1.

                    Revolving Credit Maturity Date.  April 10, 1998, on
          which date the Revolving Credit Commitment is scheduled to
          terminate in its entirety, unless prior to that date the
          Revolving Credit Commitment is reduced to $0 pursuant to Section
          5.2, in which case "Revolving Credit Maturity Date" means such
          earlier date on which the Revolving Credit Commitment is so
          reduced to $0.

                    Revolving Credit Note.  As defined in Section 4.2.

                    Rolling Four Quarters.  The four consecutive fiscal
          quarters ending with the most recently ended fiscal quarter.

                    Security Agreements.  The several Security Agreements
          dated as of the date hereof between the GPC Borrowers and the
          Bank and each substantially in the form of Exhibit B hereto.

                    Security Documents.  The Security Agreements, the GPC
          Note Pledge Agreement and the Pledge Agreement.

                    Subordinated Debt.  Unsecured Indebtedness of any
          Borrower that is expressly subordinated and made junior to the
          payment and performance in full of the NPDC Obligations or the
          GPC Obligations, as the case may be, and evidenced as such by (a)
          the Subordination and Intercreditor Agreement, (b) the NPDC
          Subordinated Pledged Note or (c) one or more other written
          instruments containing subordination provisions in form and
          substance approved by the Bank in writing.

                    Subordination and Intercreditor Agreement.  The
          Subordination and Intercreditor Agreement dated as of the date
          hereof among the Bank, NPDC and GPC and substantially in the form
          of Exhibit J hereto.

                    Subordination Documents.  The Subordination and
          Intercreditor Agreement, the NPDC Subordinated Pledged Note, the
          Indenture and the Pledged Debentures.

                    Subsidiary.  Any corporation, association, trust (other
          than a trust related to an employee benefit plan), or other
          business entity of which the designated parent shall at any time
          own directly or indirectly through a Subsidiary or Subsidiaries
          at least a majority (by number of votes) of the outstanding
          Voting Stock, provided, that for purposes of this Agreement
          (including, without limitation, the calculation of the financial
          covenants set forth in Sections 10.14 through 10.18 and the
          definitions related thereto), each Foreign Subsidiary and the
          Joint Venture shall not be Subsidiaries of GPC.

                    Term Loan.  As defined in Section 3.1

                    Term Loan Commitment.  As defined in Section 3.1.

                    Term Loan Maturity Date.  April 31, 2000.

                    Term Loan Request.  As defined in Section 3.3.

                    Term Note.  As defined in Section 3.2.

                    Type.  As to any Loan, its nature as a Prime Rate Loan
          or a LIBOR Rate Loan.

                    Uniform Customs.  With respect to any Letter of Credit,
          the Uniform Customs and Practice for Documentary Credits (1993
          Revision), International Chamber of Commerce Publication No. 500
          or any successor version thereto adopted by the Bank in the
          ordinary course of its business as a letter of credit issuer and
          in effect at the time of issuance of such Letter of Credit.

                    Unpaid Reimbursement Obligation.  Any Reimbursement
          Obligation for which the GPC Borrowers did not reimburse the Bank
          on the date specified in, and in accordance with, Section 6.2.

                    Voting Stock.  Stock, equity or similar interests
          however characterized, of any class or classes (however
          designated), the holders of which are at the time entitled, as
          such holders, to vote for the election of a majority of the
          directors (or officers performing similar functions) of the
          corporation, association, trust or other business entity
          involved, whether or not the right so to vote exists by reason of
          the happening of a contingency.

                    Section 1.2.  Rules of Interpretation.

                    (a)  A reference to any document or agreement shall
          include such document or agreement as amended, modified, waived
          or supplemented from time to time in accordance with its terms
          and the terms of this Credit Agreement.

                    (b)  The singular includes the plural and the plural
          includes the singular.

                    (c)  A reference to any law or regulation includes any
          amendment or modification to such law or regulation.

                    (d)  A reference to any Person includes its permitted
          successors and permitted assigns.

                    (e)  Accounting terms not otherwise defined herein have
          the meanings assigned to them by generally accepted accounting
          principles applied on a consistent basis by the accounting entity
          to which they refer.

                    (f)  The words "include", "includes" and "including"
          are not limiting.

                    (g)  All terms not specifically defined herein or by
          generally accepted accounting principles, which terms are defined
          in the Uniform Commercial Code as in effect in the State of New
          York, have the meanings assigned to them therein.

                    (h)  Reference to a particular "Section" refers to that
          section of this Credit Agreement unless otherwise indicated.

                    (i)  The words "herein", "hereof", "hereunder" and
          words of like import shall refer to this Credit Agreement as a
          whole and not to any particular section or subdivision of this
          Credit Agreement.


                                      ARTICLE II

                                THE CREDIT FACILITIES

                    Section 2.1.  The Facilities.  This Credit Agreement
          includes two credit facilities:  a term loan credit facility for
          NPDC and a revolving credit facility for the GPC Borrowers.  The
          term loan facility provides for a loan to NPDC in an amount up to
          the Term Loan Commitment of $5,000,000.  The revolving credit
          facility provides for Revolving Credit Loans and Letters of
          Credit to the GPC Borrowers in an aggregate amount up to the
          initial Revolving Credit Commitment of $20,000,000 (the
          "Revolving Credit Commitment").  Within the revolving credit
          facility, there is a letter of credit sub-facility under which
          the GPC Borrowers may open Letters of Credit that are part of,
          and charged against credit availability under, the revolving
          credit facility, provided, however, that the sum of the Maximum
          Drawing Amount on all Letters of Credit and the amount of all
          Reimbursement Obligations shall not at any time exceed $750,000. 
          Upon compliance with the provisions of Section 9.16, GPC may
          advance $2,000,000, at any time outstanding, of the proceeds of
          the Revolving Credit Loans to NPDC and such amounts may be repaid
          to GPC and reborrowed by NPDC.  Until the Revolving Credit
          Maturity Date and upon compliance with the provisions of Section
          9.16, GPC may advance to the Foreign Subsidiaries (i) up to
          $360,000 at any one time outstanding of the proceeds of the
          Revolving Credit Loans during the twelve-month period commencing
          on the date hereof and (ii) for each twelve-month period
          thereafter, an amount equal to $360,000 at any one time
          outstanding plus the aggregate amount of the loans by GPC to the
          Foreign Subsidiaries from the proceeds of the Revolving Credit
          Loans outstanding on the last day immediately prior to the
          commencement of such twelve-month period.


                                     ARTICLE III

                            AMOUNT AND TERMS OF TERM LOAN

                    Section 3.1.  Commitment to Lend.  (a)  Subject to the
          terms and conditions hereof, the Bank agrees to make a term loan
          (the "Term Loan") to NPDC on the Closing Date, in a principal
          amount equal to $5,000,000 (the "Term Loan Commitment").

                    (b)  Subject to the terms and conditions hereof, the
          Term Loan shall be a Prime Rate Loan.

                    Section 3.2.  Term Note.  The Term Loan shall be
          evidenced by a promissory note of NPDC, substantially in the form
          of Exhibit A-1 (the  "Term Note"), with appropriate insertions
          therein as to principal amount, payable to the order of the Bank
          and representing the obligation of NPDC to pay a principal amount
          equal to the amount of the Term Loan, with interest thereon.  The
          Bank is hereby authorized to record the Drawdown Date and
          principal amount of the Term Loan and the date and amount of each
          payment or prepayment of principal thereof on the Note Record for
          the Term Note, and any such recordation shall constitute prima
          facie evidence of the accuracy of the information so recorded in
          the absence of manifest error; provided that failure by the Bank
          to make any recordation on the Term Note shall not affect any of
          the obligations of NPDC under the Term Note or this Credit
          Agreement.  The Term Note shall (i) be dated the Closing Date,
          (ii) bear interest, payable as specified in subsection 5.1, and
          (iii) be stated to be payable in sixteen consecutive quarterly
          installments (each a "Payment Date") commencing on June 30, 1996,
          the amount of the first fifteen such installments to be equal to
          $250,000 and the amount of the last such installment to be equal
          to $1,250,000.

                    Section 3.3.  Procedure for Term Loan Borrowing.  NPDC
          shall give the Bank irrevocable written notice (or telephonic
          notice promptly confirmed in writing) in the form of Exhibit E-2
          hereto of the Term Loan requested hereunder (a "Term Loan
          Request") not later than 10:00 A.M. (New York City time) one
          Business Day prior to the anticipated Closing Date requesting
          that the Bank make the Term Loan on the Closing Date and
          specifying the principal amount of the Term Loan and the Closing
          Date.  The Term Loan Request shall be irrevocable and binding on
          NPDC and shall obligate NPDC to accept the Term Loan from the
          Bank on the Closing Date.  The Term Loan Request shall constitute
          a representation and warranty by NPDC that the conditions set
          forth in Article XII and Article XIII (other than those stated to
          be to the satisfaction of the Bank or words of similar import)
          have been satisfied or waived on the date of such request.  Not
          later than 1:00 P.M. (New York City time) on the Closing Date,
          upon receipt of such notice and the documents required by
          Articles XII and XIII and the satisfaction of the other
          conditions set forth therein, in each case to the extent
          applicable, the Bank will make available to NPDC, at the Bank's
          Office, in immediately available funds, the amount of the
          requested Term Loan.

                    Section 3.4.  Use of Proceeds of the Term Loan.  The
          proceeds of the Term Loan will be used solely for the partial
          repayment of certain Swiss Franc denominated long-term debt of
          NPDC due in 1995 and 1996 and for reimbursement to NPDC of
          amounts previously paid by NPDC in 1995 for such purpose. 
          Pending such use, the proceeds shall be invested by NPDC in
          investments substantially similar to those described in Sections
          10.3(a), (b) and (c).


                                      ARTICLE IV

                            THE REVOLVING CREDIT FACILITY

                    Section 4.1.  Commitment to Lend.  (a)  Subject to the
          terms and conditions hereof (including, without limitation, the
          last two sentences of Section 2.1), the Bank agrees to make
          revolving credit loans ("Revolving Credit Loans") to the GPC
          Borrowers and the GPC Borrowers, on a joint and several basis,
          may borrow, repay, and reborrow from time to time between the
          Closing Date and the Revolving Credit Maturity Date upon notice
          by any Borrower to the Bank given in accordance with Section 4.3,
          such Revolving Credit Loans as are requested by GPC on behalf of
          the GPC Borrowers up to a maximum amount (after giving effect to
          all amounts requested) at any one time equal to the Available
          Credit.

                    (b)  Subject to the terms and conditions hereof, the
          Revolving Credit Loans may be (i) Prime Rate Loans, (ii) LIBOR
          Rate Loans or (iii) a combination thereof, as determined by GPC,
          on behalf of the GPC Borrowers, and notified to the Bank in
          accordance with subsections 4.3 and 5.3.

                    Section 4.2.  Revolving Credit Note.  The Revolving
          Credit Loans shall be evidenced by a promissory note of the GPC
          Borrowers, substantially in the form of Exhibit A-2 (the
          "Revolving Credit Note"), with appropriate insertions as to
          principal amount, payable to the order of the Bank and
          representing the joint and several obligation of the GPC
          Borrowers to pay a principal amount equal to the lesser of (a)
          the amount of the Revolving Credit Commitment or, (b) the
          outstanding amount of all Revolving Credit Loans, with interest
          thereon, and all costs and expenses in connection therewith or
          with any other Loan Document.  The Bank is hereby authorized to
          record the Drawdown Date, Type and principal amount of each
          Revolving Credit Loan, each continuation thereof, each conversion
          of all or a portion thereof to another Type, the date and amount
          of each payment or prepayment of principal thereof and, in the
          case of LIBOR Rate Loans, the length of each Interest Period with
          respect thereto on the Note Record, and any such recordation
          shall constitute prima facie evidence of the accuracy of the
          information so recorded in the absence of manifest error;
          provided, that the failure by the Bank to make any recordation on
          the Revolving Credit Note shall not affect any of the obligations
          of the GPC Borrowers under the Revolving Credit Note or this
          Agreement.  The Revolving Credit Note shall (i) be dated the
          Closing Date, (ii) bear interest, payable as specified in
          subsection 5.1 and (iii) be stated to mature on the Revolving
          Credit Maturity Date.  

                    Section 4.3.  Procedure for Revolving Credit Borrowing.

          GPC, on behalf of the GPC Borrowers, shall give to the Bank
          irrevocable written notice (or telephonic notice promptly
          confirmed in a writing) in the form of Exhibit E-1 hereto of each
          Revolving Credit Loan requested hereunder (a "Loan Request") not
          later than 10:00 A.M. (New York City time) (a) on the same
          Business Day as the proposed Drawdown Date of any Prime Rate Loan
          and (b) on the third LIBOR Business Day prior to the proposed
          Drawdown Date of any LIBOR Rate Loan.  Each such notice shall
          specify (i) the principal amount of the Revolving Credit Loan
          requested, (ii) the proposed Drawdown Date of such Loan, (iii) if
          a LIBOR Rate Loan, the Interest Period for such Loan, and (iv)
          the Type of such Revolving Credit Loan.  Each Loan Request shall
          be irrevocable and binding on the Borrowers and shall obligate
          GPC, on behalf of the Borrowers, to accept the Loan requested
          from the Bank on the proposed Drawdown Date.  Each Loan Request
          hereunder shall constitute a representation and warranty by each
          of the GPC Borrowers that the conditions set forth in Article XII
          and Article XIII, in the case of the initial Revolving Credit
          Loans to be made on the Closing Date, and Article XIII, in the
          case of all other Revolving Credit Loans (in each case other than
          those conditions stated to be to the satisfaction of the Bank or
          words of similar import), have been satisfied or waived on the
          date of such request.  Each Loan Request shall be in a minimum
          aggregate amount of $100,000.  Not later than 1:00 P.M. (New York
          City time) on the proposed Drawdown Date of any Revolving Credit
          Loan, upon receipt of the documents required by Articles XII and
          XIII and the satisfaction of the other conditions set forth
          therein, in each case to the extent applicable, the Bank will
          make available to GPC, on behalf of the GPC Borrowers, at the
          Bank's Office, in immediately available funds, the amount of the
          requested Revolving Credit Loan.

                    Section 4.4.  Use of Proceeds of the Revolving Credit
          Loans.  The GPC Borrowers will use the proceeds of the Revolving
          Credit Loans solely for working capital purposes and other
          purposes not prohibited by this Agreement.  Upon compliance with
          the provisions of Section 9.16, GPC may advance $2,000,000, at
          any time outstanding, of the proceeds of the Revolving Credit
          Loans to NPDC and such amounts may be repaid to GPC and
          reborrowed by NPDC.  Until the Revolving Credit Maturity Date and
          upon compliance with the provisions of Section 9.16, GPC may
          advance to the Foreign Subsidiaries (i) up to $360,000 at any one
          time outstanding of the proceeds of the Revolving Credit Loans
          during the twelve-month period commencing on the date hereof and
          (ii) for each twelve-month period thereafter, an amount equal to
          $360,000 at any one time outstanding plus the aggregate amount of
          the loans by GPC to the Foreign Subsidiaries from the proceeds of
          the Revolving Credit Loans outstanding on the last day
          immediately prior to the commencement of such twelve-month
          period.


                                      ARTICLE V

                    INTEREST, CONVERSIONS, PAYMENTS, COSTS, ETC. 

                    Section 5.1.   Interest.

                         5.1.1.  Interest on Loans.  Except as otherwise
          provided in Section 5.1.2:

                    (a)  The Term Loan shall bear interest for each day at
          a rate per annum equal to the Prime Rate plus two percent (2%). 
          NPDC promises to pay interest on the outstanding principal amount
          of the Term Loan, in arrears, on each Interest Payment Date with
          respect thereto.

                    (b)  Each Prime Rate Revolving Credit Loan shall bear
          interest for each day at a rate per annum equal to the Prime Rate
          for such day.

                    (c)  Each LIBOR Rate Loan shall bear interest for each
          day during each Interest Period with respect thereto at a rate
          per annum equal to the LIBOR Rate determined for such day plus
          one and three quarters of one percent (1.75%).

                    (d)  The GPC Borrowers, jointly and severally, promise
          to pay interest on each Revolving Credit Loan, in arrears, on
          each Interest Payment Date with respect thereto.

                         5.1.2.  Interest After Default.  If all or a
          portion of (i) the principal amount of any Loan (ii) any interest
          payable thereon or (iii) any other amount payable hereunder or
          under any of the other Loan Documents shall not be paid when due
          (whether at the stated maturity, by acceleration or otherwise),
          such overdue amount shall bear interest at a rate per annum equal
          to (a) in the case of overdue principal and overdue interest on
          any Loan, two percent (2%) above the rate of interest otherwise
          applicable to such Loan pursuant to Section 5.1.1 during such
          period and (b) in the case of other overdue amounts, two percent
          (2%) above the rate of interest applicable to Prime Rate Loans
          during such period (the "Overdue Rate") in each case from the
          date of such non-payment until such amount is paid in full (as
          well after as before judgment).  Accrued interest at the Overdue
          Rate shall be payable from time to time on demand of the Bank.

                    Section 5.2.   Reduction of Revolving Credit
          Commitments.  GPC, on behalf of the GPC Borrowers, shall have the
          right, at any time and from time to time upon five (5) Business
          Days' irrevocable written notice to the Bank, to reduce by
          $500,000 or an integral multiple thereof or terminate entirely
          the Revolving Credit Commitment, whereupon the Revolving Credit
          Commitment shall be reduced by the amount specified in such
          notice, or as the case may be, terminated.  No reduction or
          termination of the Revolving Credit Commitment pursuant to this
          Section 5.2 may be reinstated.

                    Section 5.3.  Revolving Credit Loan Conversion Options.

                         5.3.1.  Conversion to Different Type of Loan. 
          Subject to the terms and conditions of this Credit Agreement,
          GPC, on behalf of the Borrowers, may elect from time to time to
          convert any outstanding Revolving Credit Loan to a Revolving
          Credit Loan of another Type, provided, that (a) with respect to
          any such conversion of a LIBOR Rate Loan to a Prime Rate
          Revolving Credit Loan, the GPC Borrowers shall give the Bank
          written notice of such election by not later than 10:00 A.M. (New
          York City time) on the same Business Day as the proposed
          conversion; (b) with respect to any such conversion of a LIBOR
          Rate Loan into a Prime Rate Revolving Credit Loan, such
          conversion shall only be made on the last day of the Interest
          Period with respect to the LIBOR Rate Loan; (c) with respect to
          any such conversion of a Prime Rate Revolving Credit Loan to a
          LIBOR Rate Loan, the Borrowers shall give the Bank written notice
          of such election by not later than 10:00 A.M. (New York City
          time) on the third LIBOR Business Day before the proposed
          conversion; and (d) no Revolving Credit Loan may be converted
          into a LIBOR Rate Loan when either a Default or Event of Default
          has occurred and is continuing.  All or any part of outstanding
          Revolving Credit Loans of either Type may be converted into a
          Revolving Credit Loan of the other Type as provided herein,
          provided, that any partial conversion shall be in an aggregate
          principal amount of $250,000 or a whole multiple thereof.  Each
          Conversion Request relating to the conversion of a Revolving
          Credit Loan to a LIBOR Rate Loan shall be irrevocable by the
          Borrowers.

                         5.3.2.  Continuation of Type of Loan.    Subject
          to the terms and conditions of this Credit Agreement, any LIBOR
          Rate Loan may be continued as a Loan of the same Type upon the
          expiration of an Interest Period with respect thereto by
          compliance by GPC, on behalf of the Borrowers, with the notice
          provisions contained in Section 5.3.1; provided, that no LIBOR
          Rate Loan may be continued as such when any Default or Event of
          Default has occurred and is continuing, but shall be
          automatically converted to a Prime Rate Revolving Credit Loan on
          the last day of the first Interest Period relating to the LIBOR
          Rate Loan ending during the continuance of any Default or Event
          of Default of which officers of the Bank actively engaged in
          administering the Borrowers' account have actual knowledge.

                         5.3.3.  Deemed Conversion.  If the applicable GPC
          Borrower shall fail to provide the conversion or continuation
          notice required by this Section 5.3 prior to the expiration of an
          Interest Period for a LIBOR Rate Loan, such GPC Borrower shall be
          deemed to have requested a conversion of such LIBOR Rate Loan to
          a Prime Rate Loan on the last day of the Interest Period with
          respect thereto.

                    Section 5.4.  Repayment of the Loans.  

                         5.4.1.  Maturity.  (a)  NPDC irrevocably and
          unconditionally promises to pay on each Payment Date, and there
          shall become absolutely due and payable on each Payment Date, the
          principal amount of the Term Loan set forth in Section 3.2 as
          payable on such Payment Date, together with any and all accrued
          and unpaid interest thereon and any and all fees and expenses
          payable by NPDC under any of the Loan Documents.

                    (b)  The GPC Borrowers, jointly and severally,
          irrevocably and unconditionally promise to pay on the Revolving
          Credit Maturity Date, and there shall become absolutely due and
          payable on the Revolving Credit Maturity Date, all of the
          Revolving Credit Loans outstanding on such date, together with
          any and all accrued and unpaid interest thereon and any and all
          fees and expenses payable by such parties under any of the Loan
          Documents.

                         5.4.2.  Mandatory Repayment of Revolving Credit
          Loans.  If at any time the Available Credit at such time should
          be less than $0, the amount equal to an amount sufficient to make
          the Available Credit equal to $0 shall be immediately due and
          payable to the Bank to be applied to the GPC Obligations arising
          in respect of this Credit Agreement, and the GPC Borrowers,
          jointly and severally, hereby irrevocably and unconditionally
          promise to pay such amount, immediately and without notice,
          demand, or any other act or action by the Bank or any other
          Person, which amount shall be paid to the Bank for application:
          first, to any Unpaid Reimbursement Obligations; second, to the
          Revolving Credit Loans; and third, to provide to the Bank cash
          collateral for Reimbursement Obligations as contemplated by
          Section 6.2(b) and (c).

                         5.4.3.  Optional Repayments of Loans.  NPDC shall
          have the right, at its election, to repay the outstanding amount
          of the Term Loan, as a whole or in part, at any time without
          penalty or premium, and the GPC Borrowers shall have the right,
          at their election, to repay the outstanding amount of the
          Revolving Credit Loans, as a whole or in part, at any time
          without penalty or premium; provided, that any full or partial
          prepayment of the outstanding amount of any LIBOR Rate Loans
          pursuant to this Section 5.4.3 may be made only on the last day
          of the Interest Period relating thereto.  NPDC or GPC, as
          appropriate, shall give the Bank, no later than 10:00 A.M., New
          York City time, at least one (1) Business Days' prior written
          notice of any proposed prepayment pursuant to this Section 5.4.3
          of Prime Rate Loans, and three (3) LIBOR Business Days' notice of
          any proposed prepayment pursuant to this Section 5.4.3 of LIBOR
          Rate Loans, in each case specifying the proposed date of
          prepayment of Loans and the principal amount to be prepaid.  Each
          such partial prepayment of the Loans shall be in an integral
          multiple of $100,000, shall be accompanied by the payment of
          accrued interest on the principal prepaid to the date of
          prepayment and shall be applied, (a) in the case of Revolving
          Credit Loans and in the absence of instruction by the GPC
          Borrowers, first to the principal of Prime Rate Revolving Credit
          Loans and then to the principal of LIBOR Rate Loans and (b) in
          the case of the Term Loan to installments of principal in the
          inverse order of the maturity thereof.  Any prepayment of the
          Term Loan may not be reborrowed.

                    Section 5.5.  Certain Fees and Costs.  

                         5.5.1.  NPDC Closing Fee.  NPDC agrees to pay to
          the Bank on the Closing Date a $100,000 closing fee.  The closing
          fee is fully earned and is nonrefundable.

                         5.5.2.  Commitment Fee.  The GPC Borrowers,
          jointly and severally, agree to pay to the Bank a commitment fee
          calculated at the rate of one-half of one percent (1/2 of 1%) per
          annum on the average daily amount during each calendar quarter or
          portion thereof from the Closing Date to the Revolving Credit
          Maturity Date by which the Revolving Credit Commitment exceeds
          the average daily outstanding amount of Revolving Credit Loans
          during such calendar quarter.  The commitment fee shall be
          payable quarterly in arrears on the last day of each calendar
          quarter for such calendar quarter commencing on the first such
          date following the date hereof, with a final payment on the
          Revolving Credit Maturity Date or any earlier date on which the
          Revolving Credit Commitment shall terminate.

                         5.5.3.  Letter of Credit Fee.  The GPC Borrowers,
          jointly and severally, shall, in connection with the issuance or
          any extension or renewal of any Letter of Credit, pay a fee (in
          each case, a "Letter of Credit Fee") to the Bank in respect of
          each Letter of Credit equal to one percent (1%) per annum of the
          face amount of such Letter of Credit payable quarterly in advance
          and which is fully earned when paid and nonrefundable plus the
          Bank's customary issuance fees.

                         5.5.4.  Additional Costs, Etc.  If after the date
          hereof the adoption of or change in any Applicable Law issued or
          made applicable to the Bank by any central bank or other fiscal,
          monetary or other authority (whether or not having the force of
          law) or any change in the interpretation or application of any
          Applicable Law by a court or government authority with
          appropriate jurisdiction, shall:

                    (a)  subject the Bank to any tax, levy, impost, duty,
          charge, fee, deduction or withholding of any nature with respect
          to this Credit Agreement, the other Loan Documents, any Letters
          of Credit, any Letter of Credit Application, the Revolving Credit
          Commitment or the LIBOR Rate Loans (other than net income taxes
          and franchise taxes imposed in lieu of net income taxes), or

                    (b)  materially change the basis of taxation (except
          for changes in taxes on income or profits) of payments to the
          Bank of the principal of or the interest on any LIBOR Rate Loans
          or any other amounts payable to the Bank under this Credit
          Agreement or any of the other Loan Documents, or

                    (c)  impose or increase or render applicable (other
          than to the extent specifically provided for elsewhere in this
          Credit Agreement) any special deposit, reserve, assessment,
          liquidity, capital adequacy or other similar requirements
          (whether or not having the force of law) against assets held by,
          or deposits in or for the account of, or loans by, or letters of
          credit issued by, or commitments of an office of the Bank, or

                    (d)  impose on the Bank any other conditions or
          requirements with respect to this Credit Agreement, the other
          Loan Documents, any Letters of Credit, the LIBOR Rate Loans, the
          Revolving Credit Commitment, or any class of loans, letters of
          credit or commitments of which any of the LIBOR Rate Loans or the
          Revolving Credit Commitment forms a part, and the result of any
          of the foregoing is

                                   (i)  to increase the cost to the Bank of
          making,
                    funding, issuing, renewing, extending or maintaining
                    any of the LIBOR Rate Loans or the Revolving Credit
                    Commitment or any Letter of Credit, or

                                  (ii)  to reduce the amount of principal,
          interest,
                    Reimbursement Obligation or other amount payable to the
                    Bank hereunder, in each case on account of the
                    Revolving Credit Commitment, any Letter of Credit or
                    any of the LIBOR Rate Loans, or

                                 (iii)  to require the Bank to make any
          payment or to
                    forego any interest or Reimbursement Obligation or
                    other sum payable hereunder, in each case on account of
                    the Revolving Credit Commitment, any Letter of Credit
                    or any of the LIBOR Rate Loans, the amount of which
                    payment or foregone interest or Reimbursement
                    Obligation or other sum is calculated by reference to
                    the gross amount of any sum receivable or deemed
                    received by the Bank from any GPC Borrower hereunder,
          then, and in each such case, the GPC Borrowers, jointly and
          severally will, not later than five (5) days after demand made by
          the Bank and receipt by GPC of the certificate described in
          Section 5.5.6, at any time and from time to time and as often as
          the occasion therefor may arise, pay to the Bank such additional
          amounts (excluding amounts duplicative of amounts payable under
          Section 5.5.5) as will be sufficient to compensate the Bank for
          such additional cost, reduction, payment or foregone interest or
          Reimbursement Obligation or other sum.  In the event that the
          Bank demands compensation under this Section 5.5.4, then (without
          limiting or reducing the obligations of the GPC Borrowers,
          jointly and severally, under this Section 5.5.4) the Bank shall
          take reasonable steps to mitigate the circumstances resulting in
          such demand, provided, that the Bank shall not be required to
          take any such steps if, in its opinion, such steps (i) would be
          inconsistent with the Banks internal policies, (ii) would or
          might have an adverse effect upon the Bank's business, operations
          or financial condition or (iii) would result in any cost,
          liability or expense to the Bank.

                         5.5.5.  Capital Adequacy.  If after the date
          hereof the Bank determines that (a) the adoption of or change
          after the date hereof in any Applicable Law regarding capital
          requirements for banks or bank holding companies or any change in
          the interpretation or application thereof by a court or
          governmental authority with appropriate jurisdiction occurring
          after the date hereof, or (b) compliance by the Bank or any
          corporation controlling the Bank with any Applicable Law
          regarding capital adequacy as a result of any adoption or change
          referred to in clause (a) above, has the effect of reducing the
          return on the Bank's commitment with respect to any Revolving
          Credit Loans or Letters of Credit to a level below that which the
          Bank could have achieved but for such adoption, change or
          compliance (taking into consideration the Bank's then existing
          policies with respect to capital adequacy and assuming full
          utilization of such entity's capital) by any amount deemed by the
          Bank to be material, then the Bank may notify the GPC Borrowers
          of such fact.  To the extent that the amount of such reduction in
          the return on capital is not reflected in the Prime Rate, the GPC
          Borrowers, jointly and severally agree to pay the Bank for the
          amount of such reduction in the return on capital as and when
          such reduction is determined not later than five (5) days after
          demand by the Bank and receipt by GPC of the certificate
          described in Section 5.5.6.  The Bank shall allocate such cost
          increases among its customers in good faith and on an equitable
          basis.

                         5.5.6.  Certificate.  A certificate setting forth
          any additional amounts payable pursuant to Section 5.5.4 or
          Section 5.5.5 and a brief explanation of such amounts that are
          due, submitted by the Bank to the GPC Borrowers, shall be prima
          facie evidence, absent manifest error, that such amounts are due
          and owing.

                    Section 5.6.  Payments and Computations.  

                         5.6.1.  Funds for Payments.

                              5.6.1.1.  Payment to Bank.  All payments of
          principal, interest, Reimbursement Obligations, the closing fee,
          commitment fees, Letter of Credit Fees and any other amounts due
          hereunder or under any of the other Loan Documents shall be made
          to the Bank, at the Bank's Office or at such other location that
          the Bank may from time to time designate, in each case in Dollars
          and in immediately available funds, not later than 11:00 a.m.,
          New York city time, on the date on which such payment shall
          become due.  Any such payment made on such date but after such
          time shall, if the amount paid bears interest, be deemed to have
          been made on, and interest shall continue to accrue and be
          payable thereon until, the next succeeding Business Day.

                              5.6.1.2.  No Offset, Etc.  All payments by
          any Borrower hereunder and under any of the other Loan Documents
          shall be made without setoff or counterclaim and free and clear
          of and without deduction for any taxes (other than net income
          taxes or franchise taxes imposed in lieu of net income taxes),
          levies, imposts, duties, charges, fees, deductions, withholdings,
          compulsory loans, restrictions or conditions of any nature now or
          hereafter imposed or levied by any jurisdiction or any political
          subdivision thereof or taxing or other authority therein unless
          required by law.  If any such obligation is imposed upon such
          Borrower with respect to any amount payable by it hereunder or
          under any of the other Loan Documents, (i) NPDC or (ii) the GPC
          Borrowers, jointly and severally, as the case may be, will pay to
          the Bank, on the date on which such amount is due and payable
          hereunder or under such other Loan Document, such additional
          amount in Dollars as shall be necessary to enable the Bank to
          receive the same net amount that the Bank would have received on
          such due date had no such obligation been imposed upon such
          Borrower.  The agreements in this Section 5.6.1.2 shall survive
          the termination of this Credit Agreement and the payment of the
          Loans, Letters of Credit and all other amounts payable hereunder.

                         5.6.2.  Computations; Records.  All computations
          of interest on the Loans and of commitment fees, Letter of Credit
          Fees or other fees shall be based on a 360-day year and paid for
          the actual number of days elapsed.  All fees payable hereunder
          shall be fully earned when paid and nonrefundable.  Except as
          otherwise provided in the definition of the term "Interest
          Period" with respect to LIBOR Rate Loans, whenever a payment
          hereunder or under any of the other Loan Documents becomes due on
          a day that is not a Business Day, the due date for such payment
          shall be extended to the next succeeding Business Day, and
          interest shall accrue during such extension.  The outstanding
          amount of the Loans as reflected on the applicable Note Record
          from time to time shall constitute prima facie evidence of the
          accuracy of such information so recorded in the absence of
          manifest error; provided, that failure by the Bank to make any
          recordation on the applicable Note Record shall not affect any of
          the obligations of (a) NPDC or (b) the GPC Borrowers, jointly and
          severally, as the case may be, under this Credit Agreement or any
          other Loan Document.

                    Section 5.7.  Inability to Determine LIBOR Rate.  In
          the event, prior to the commencement of any Interest Period
          relating to any LIBOR Rate Loan, the Bank shall reasonably
          determine that adequate and reasonable methods do not exist for
          ascertaining the LIBOR Rate that would otherwise determine the
          rate of interest to be applicable to any LIBOR Rate Loan during
          any Interest Period, the Bank shall forthwith give notice of such
          determination to the GPC Borrowers (which shall be conclusive and
          binding on the GPC Borrowers).  In such event (a) any Loan
          Request or Conversion Request with respect to LIBOR Rate Loans
          shall be automatically withdrawn and shall be deemed a request
          for Prime Rate Loans, (b) each LIBOR Rate Loan will
          automatically, on the last day of the then current Interest
          Period relating thereto, become a Prime Rate Revolving Credit
          Loan, and (c) the obligations of the Bank to make LIBOR Rate
          Loans shall be suspended until the Bank reasonably determines
          that the circumstances giving rise to such suspension no longer
          exist, whereupon the Bank shall so notify the GPC Borrowers.

                    Section 5.8.  Illegality.  Notwithstanding any other
          provisions herein, if any present or future law, regulation,
          treaty or directive or in the interpretation or application
          thereof shall make it unlawful for the Bank to make or maintain
          LIBOR Rate Loans, the Bank shall forthwith give notice of such
          circumstances to the GPC Borrowers and thereupon (a) the
          commitment of the Bank to make LIBOR Rate Loans or convert Prime
          Rate Revolving Credit Loans to LIBOR Rate Loans shall forthwith
          be suspended and (b) the Revolving Credit Loans then outstanding
          as LIBOR Rate Loans, if any, shall be converted automatically to
          Prime Rate Revolving Credit Loans on the last day of each
          Interest Period applicable to such LIBOR Rate Loans or within
          such earlier period as may be required by law.  The GPC
          Borrowers, jointly and severally, hereby agree promptly to pay
          the Bank, upon demand by the Bank, any additional amounts
          necessary to compensate the Bank for any costs incurred by the
          Bank in making any conversion in accordance with this Section
          5.8, including any interest or fees payable by the Bank to
          lenders of funds obtained by it in order to make or maintain its
          LIBOR Rate Loans hereunder.

                    Section 5.9.  Indemnity.  The GPC Borrowers, jointly
          and severally, agree to indemnify the Bank and to hold the Bank
          harmless from and against any loss, cost or expense (excluding
          loss of anticipated profits) that the Bank may sustain or incur
          as a consequence of default by any GPC Borrower in making a
          borrowing, conversion into or continuation of a LIBOR Rate Loan
          after such Borrower has given (or is deemed to have given) a Loan
          Request or a Conversion Request relating thereto in accordance
          with Section 4.3 or Section 5.3, default by any GPC Borrower in
          making any prepayment after such GPC Borrower has given a notice
          thereof in accordance with the provisions of this Credit
          Agreement or the making of any payment of a LIBOR Rate Loan
          (including, without limitation, as a result of any acceleration
          of the Revolving Credit Loans in accordance with Section 14.1) or
          the making of any conversion of any such Revolving Credit Loan to
          a Prime Rate Loan on a day that is not the last day of the
          applicable Interest Period with respect thereto, including
          interest or fees payable by the Bank to lenders of funds obtained
          by it in order to maintain any such Revolving Credit Loans.

                    Section 5.10.  Concerning Joint and Several Liability
          of the GPC Borrowers.  

                    (a)  Each of the GPC Borrowers is accepting joint and
          several liability hereunder in consideration of the financial
          accommodation to be provided by the Bank under this Credit
          Agreement, for the mutual benefit, directly and indirectly, of
          each of the GPC Borrowers and in consideration of the
          undertakings of each of the GPC Borrowers to accept joint and
          several liability for the obligations of each of them.

                    (b)  Each of the GPC Borrowers jointly and severally
          hereby irrevocably and unconditionally accepts, not merely as a
          surety but also as a co-debtor, joint and several liability with
          the other GPC Borrowers with respect to the payment and
          performance of all of the GPC Obligations, it being the intention
          of the parties hereto that all the GPC Obligations shall be the
          joint and several obligations of each of the GPC Borrowers
          without preferences or distinction among them.

                    (c)  If and to the extent that any of the GPC Borrowers
          shall fail to make any payment with respect to any of the GPC
          Obligations as and when due or to perform any of the GPC
          Obligations in accordance with the terms thereof, then in each
          such event, the other GPC Borrowers will make such payment with
          respect to, or perform, such GPC Obligation.

                    (d)  The obligations of each GPC Borrower under the
          provisions of this Section 5.10 constitute full recourse
          obligations of such Borrower, enforceable against it to the full
          extent of its properties and assets, irrespective of the
          validity, regularity or enforceability of this Agreement or any
          other circumstances whatsoever.

                    (e)  Except as otherwise expressly provided herein,
          each GPC Borrower hereby waives notice of acceptance of its joint
          and several liability, notice of any and all Revolving Credit
          Loans made under this Credit Agreement, notice of occurrence of
          any Event of Default, or of any demand for any payment under this
          Credit Agreement, notice of any action at any time taken or
          omitted by the Bank under or in respect of any of the GPC
          Obligations, any requirement of diligence and, generally, all
          demands, notices and other formalities of every kind in
          connection with this Credit Agreement.  Each GPC Borrower hereby
          assents to, and waives notice of, any extension or postponement
          of the time for the payment of any of the GPC Obligations, the
          acceptance of any partial payment thereon, any waiver, consent or
          other action or acquiescence by the Bank at any time or times in
          respect of any default by any Borrower in the performance or
          satisfaction of any term, covenant, condition or provision of
          this Credit Agreement, any and all other indulgences whatsoever
          by the Bank in respect of any of the GPC Obligations, and the
          taking, addition, substitution or release, in whole or in part,
          at any time or times, of any security for any of the GPC
          Obligations or the addition, substitution or release, in whole or
          in part, of any GPC Borrower.  Without limiting the generality of
          the foregoing, each GPC Borrower assents to any other action or
          delay in acting or failure to act on the part of the Bank,
          including, without limitation, any failure strictly or diligently
          to assert any right or to pursue any remedy or to comply fully
          with applicable laws or regulations thereunder which might, but
          for the provisions of this Section 5.10, afford grounds for
          terminating, discharging or relieving such GPC Borrower, in whole
          or in part, from any of its obligations under this Section 5.10,
          it being the intention of each GPC Borrower that, so long as any
          of the GPC Obligations remain unsatisfied, the obligations of
          such GPC Borrower under this Section 5.10 shall not be discharged
          except by performance and then only to the extent of such
          performance.  The GPC Obligations of each GPC Borrower under this
          Section 5.10 shall not be diminished or rendered unenforceable by
          any winding up, reorganization, arrangement, liquidation,
          reconstruction or similar proceeding with respect to any GPC
          Borrower or the Bank.  The joint and several liability of the GPC
          Borrowers hereunder shall continue in full force and effect
          notwithstanding any absorption, merger, amalgamation or any other
          change whatsoever in the name, membership, constitution or place
          of formation of any GPC Borrower or the Bank.

                    (f)  The provisions of this Section 5.10 are made for
          the benefit of the Bank and its successors and assigns, and may
          be enforced by it from time to time against any of the GPC
          Borrowers as often as occasion therefor may arise and without
          requirement on the part of the Bank first to marshal any of its
          claims or to exercise any of its rights against the other GPC
          Borrowers or to exhaust any remedies available to it against the
          other GPC Borrowers or to resort to any other source or means of
          obtaining payment of any of the GPC Obligations or to elect any
          other remedy.  The provisions of this Section 5.10 shall remain
          in effect until all the GPC Obligations shall have been paid in
          full or otherwise fully satisfied.  If at any time, any payment,
          or any part thereof, made in respect of any of the GPC
          Obligations, is rescinded or must otherwise be restored or
          returned by the Bank upon the insolvency, bankruptcy or
          reorganization of any of the GPC Borrowers, or otherwise, the
          provisions of this Section 5.10 will forthwith be reinstated in
          effect, as though such payment had not been made.

                    (g)  NPDC shall have no obligations under this Section
          5.10.


                                      ARTICLE VI

                                  LETTERS OF CREDIT

                    Section 6.1.  Letter of Credit Commitment.

                         6.1.1.  Commitment to Issue Letters of Credit. 
          Subject to the terms and conditions hereof and the execution and
          delivery by the GPC Borrowers of a letter of credit application
          on the Bank's customary form as it may change from time to time
          (a "Letter of Credit Application"), the Bank agrees, in
          accordance with the Bank's usual and customary business
          practices, to issue, extend and renew for the account of the
          specified GPC Borrower one or more standby letters of credit
          (individually, a "Letter of Credit"), in such form as may be
          requested from time to time, during the period commencing on the
          Closing Date and ending on the Revolving Credit Maturity Date, by
          GPC, on behalf of the GPC Borrowers, and agreed to by the Bank;
          provided, however, that after giving effect to such request, (a)
          the sum of the aggregate Maximum Drawing Amount and all Unpaid
          Reimbursement Obligations shall not exceed $750,000 at any one
          time and (b) the Available Credit is not less than $0; and
          provided, further, that the Bank shall not issue, extend or renew
          any Letter of Credit if: (i) any order, judgment or decree of any
          governmental authority or arbitrator shall purport by its terms
          to enjoin or restrain the Bank from issuing such Letter of Credit
          or any rule, regulation or law applicable to the Bank or any
          request or directive from any governmental authority with
          jurisdiction over the issuance of letters of credit generally or
          such Letters of Credit in particular shall impose upon the Bank
          with respect to such Letters of Credit any restriction or reserve
          or capital requirement (for which the Bank is not otherwise
          compensated) not in effect on the date hereof, or any
          unreimbursed loss, cost or expense occurs which was not
          applicable, in effect or known to the Bank as of the date hereof
          and which the Bank in good faith deems material to it, (ii) any
          of the terms and provisions of Articles XII or XIII, as
          applicable, are not satisfied or (z) such issuance, extension or
          renewal would conflict with, or cause the Bank to exceed any
          limits imposed by Applicable Law.

                         6.1.2.  Procedure for Letters of Credit.  GPC, on
          behalf of any GPC Borrower, may from time to time request that
          the Bank issue, extend or renew a Letter of Credit by delivering
          to the Bank at the Bank's Office a Letter of Credit Application,
          and such other certificates, documents and other papers and
          information as the Bank may reasonably request.  Upon receipt of
          any Letter of Credit Application, the Bank will process such
          Letter of Credit Application and the certificates, documents and
          other papers and information delivered to it in connection
          therewith in accordance with its customary procedures and shall
          promptly issue, extend or renew the Letter of Credit requested
          thereby (but in no event shall the Bank be required to issue,
          extend or renew any Letter of Credit earlier than three Business
          Days after its receipt of the Letter of Credit Application
          therefor and all such other certificates, documents and other
          papers and information relating thereto) in a manner as may be
          agreed by the Bank and such GPC Borrower.  In the event that any
          provision of any Letter of Credit Application shall be
          inconsistent with any provision of this Credit Agreement, then
          the provisions of this Credit Agreement shall, to the extent of
          any such inconsistency, govern. 

                         6.1.3.  Terms of Letters of Credit.  Each Letter
          of Credit issued, extended or renewed hereunder shall be
          denominated in Dollars and, among other things, (a) provide for
          the payment of sight drafts for honor thereunder when presented
          in accordance with the terms thereof and when accompanied by the
          documents described therein, and (b) have an expiration date no
          more than one year after the date of issuance and no later than
          the date that is fourteen (14) days (or, if the beneficiary is
          located outside of the United States of America, forty-five (45)
          days) prior to the Revolving Credit Maturity Date.  Each Letter
          of Credit so issued, extended or renewed shall be subject to the
          Uniform Customs and, to the extent not inconsistent therewith,
          the laws of the State of New York.

                    Section 6.2.  Reimbursement Obligation of the
          Borrowers.  In order to induce the Bank to issue, extend and
          renew each Letter of Credit, the GPC Borrowers, jointly and
          severally, hereby irrevocably and unconditionally promise to
          reimburse or pay to the Bank with respect to each Letter of
          Credit issued, extended or renewed by the Bank hereunder,

                    (a)  except as otherwise expressly provided in Section
          6.2(b) and (c), on each date that any draft presented under such
          Letter of Credit is honored by the Bank, or the Bank otherwise
          makes a payment with respect thereto, (i) the amount paid by the
          Bank under or with respect to such Letter of Credit
          ("Reimbursement Obligations"), and (ii) the amount of any taxes,
          fees, charges or other costs and expenses whatsoever incurred by
          the Bank in connection with any payment made by the Bank under,
          or with respect to, such Letter of Credit; provided, however,
          that in the event that such amounts referred to in this
          subparagraph (a) are less than the amount of the Available Credit
          and there is no Default or Event of Default, GPC, on behalf of
          the Borrowers, shall be deemed to have requested, and the Bank
          shall be deemed to have made, a Prime Rate Revolving Credit Loan
          as of such date in satisfaction of such Reimbursement
          Obligations,

                    (b)  upon the reduction (but not termination) of the
          Revolving Credit Commitment to an amount less than the Maximum
          Drawing Amount, an amount equal to 110% of such difference, which
          amount shall be held by the Bank as cash collateral for all
          Reimbursement Obligations, and

                    (c)  upon the termination of the Revolving Credit
          Commitment, or the acceleration of the Reimbursement Obligations
          with respect to all Letters of Credit in accordance with Article
          XIV, an amount equal to 110% of the then Maximum Drawing Amount
          on all Letters of Credit, which amount shall be held by the Bank
          as cash collateral for all Reimbursement Obligations.

          Each such payment shall be made to the Bank at the Bank's Office
          in immediately available funds.  Interest on any and all amounts
          remaining unpaid by the Borrowers under this Section 6.2 at any
          time from the date such amounts become due and payable (whether
          as stated in this Section 6.2, by acceleration or otherwise)
          until payment in full (whether before or after judgment) shall be
          payable to the Bank on demand at the rate specified in Section
          5.2 for overdue principal on the Prime Rate Revolving Credit
          Loans.  

                    Section 6.3.  Letter of Credit Payments.  If any draft
          shall be presented or other demand for payment shall be made
          under any Letter of Credit, the Bank shall notify the GPC
          Borrowers of the date and amount of the draft presented or demand
          for payment and of the date and time when it expects to pay such
          draft or honor such demand for payment.  The responsibility of
          the Bank to the GPC Borrowers shall be only to determine that the
          documents (including each draft) delivered under each Letter of
          Credit in connection with such presentment shall be generally in
          conformity in all material respects with such Letter of Credit.

                    Section 6.4.  Obligations Absolute.  The GPC Borrowers'
          obligations under this Article VI shall be absolute and
          unconditional under any and all circumstances and irrespective of
          the occurrence of any Default or Event of Default or any
          condition precedent whatsoever or any setoff, counterclaim or
          defense to payment that any Borrower may have or have had against
          the Bank or any beneficiary of a Letter of Credit.  The GPC
          Borrowers further agree with the Bank that the Bank shall not be
          responsible for, and the GPC Borrowers' Reimbursement Obligations
          under Section 6.2 shall not be affected by, among other things,
          the validity or genuineness of documents or of any endorsements
          thereon, even if such documents should in fact prove to be in any
          or all respects invalid, fraudulent or forged, or any dispute
          between or among any GPC Borrower, the beneficiary of any Letter
          of Credit or any financing institution or other party to which
          any Letter of Credit may be transferred or any claims or defenses
          whatsoever of any GPC Borrower against the beneficiary of any
          Letter of Credit or any such transferee.  The Bank shall not be
          liable for any error, omission, interruption or delay in
          transmission, dispatch or delivery of any message or advice,
          however transmitted, in connection with any Letter of Credit. 
          The GPC Borrowers agree that any action taken or omitted by the
          Bank under or in connection with each Letter of Credit and the
          related drafts and documents, if done in good faith, shall be
          binding upon the GPC Borrowers and shall not result in any
          liability on the part of the Bank to the GPC Borrowers.

                    Section 6.5.  Reliance by Issuer.  To the extent not
          inconsistent with Section 6.4, the Bank shall be entitled to
          rely, and shall be fully protected in relying upon, any Letter of
          Credit, draft, writing, resolution, notice, consent, certificate,
          affidavit, letter, cablegram, telegram, telecopy, telex or
          teletype message, statement, order or other document believed by
          it to be genuine and correct and to have been signed, sent or
          made by the proper Person or Persons and upon advice and
          statements of legal counsel, independent accountants and other
          experts selected by the Bank.

                    Section 6.6.  Letter of Credit Fee.  The GPC Borrowers,
          jointly and severally, shall, in connection with the issuance or
          any extension or renewal of any Letter of Credit, pay a fee in
          accordance with Section 5.5.3.


                                     ARTICLE VII

                                 COLLATERAL SECURITY

                    Section 7.1.  Security of NPDC.  The NPDC Obligations
          shall be secured by a perfected first priority security interest
          in the NPDC Collateral pursuant to the terms of the Pledge
          Agreement.

                    Section 7.2.  Security of GPC Borrowers.  The GPC
          Obligations shall be secured by a perfected first priority
          security interest in the GPC Collateral pursuant to the terms of
          the Security Agreements and the GPC Note Pledge Agreement to
          which certain GPC Borrowers are party.


                                     ARTICLE VIII

                            REPRESENTATIONS AND WARRANTIES

               Each of the Borrowers represents and warrants to the Bank as
          follows (it being agreed that NPDC represents and warrants only
          to matters with respect to itself, but not with respect to any
          GPC Borrower, and each GPC Borrower represents and warrants only
          to matters with respect to itself and the other GPC Borrowers,
          but not with respect to NPDC):

                    Section 8.1.  Corporate Authority.  

                         8.1.1.  Incorporation; Good Standing.  Each of the
          Borrowers (a) is a corporation duly organized, validly existing
          and in good standing under the laws of its state of
          incorporation, (b) has all requisite corporate power to own its
          property and conduct its business as now conducted and as
          presently contemplated, and (c) is in good standing as a foreign
          corporation and is duly authorized to do business in each
          jurisdiction where such qualification is necessary except where a
          failure to be so qualified would not have a Materially Adverse
          Effect.

                         8.1.2.  Authorization.  The execution, delivery
          and performance of this Credit Agreement and the other Loan
          Documents to which any Borrower is or is to become a party and
          the transactions contemplated hereby and thereby (a) are within
          the corporate authority of such Borrower, (b) have been duly
          authorized by all necessary corporate proceedings, (c) do not
          conflict with or result in any breach or contravention of any
          provision of law, statute, rule or regulation to which such
          Borrower is subject or any judgment, order, writ, injunction,
          license or permit or similar document applicable to such
          Borrower, (d) do not conflict with any provision of the corporate
          charter or bylaws of such Borrower or create (with or without the
          giving of notice or lapse of time, or both), a default under or
          breach of any agreement, bond, note or indenture to which such
          Borrower is a party, or by which such Borrower is bound or any of
          its respective properties or assets is affected that would
          individually or in the aggregate have a Materially Adverse
          Effect, or result in the imposition of any Lien of any nature
          whatsoever upon any of the properties or assets owned by or used
          in connection with the business of such Borrower, except for the
          lien of this Credit Agreement and the other Loan Documents.

                         8.1.3.  Enforceability.  This Credit Agreement and
          the other Loan Documents to which any Borrower is a party have
          been duly executed and delivered by each such Borrower and will
          result in valid and legally binding obligations of such Borrower
          enforceable (subject, in the case of dispositions of the Pledged
          Stock and the Pledged Debentures (each as defined under the
          Pledge Agreement) to the Securities Act and other applicable
          securities laws and regulations) against it in accordance with
          the respective terms and provisions hereof and thereof, except as
          enforceability is limited by bankruptcy, insolvency,
          reorganization, moratorium or other laws relating to or affecting
          generally the enforcement of creditors rights and except to the
          extent that availability of the remedy of specific performance or
          injunctive relief is subject to the discretion of the court
          before which any proceeding therefor may be brought.

                    Section 8.2.  Governmental and Third Party Approvals. 
          The execution, delivery and performance by any Borrower of this
          Credit Agreement and the other Loan Documents to which such
          Borrower is or is to become a party, the grant by NPDC to the
          Bank of security interests in the NPDC Collateral, the grant by
          the GPC Borrowers to the Bank of security interests in the GPC
          Collateral and the transactions contemplated hereby and thereby
          do not require the approval or consent of, or filing with, any
          governmental agency or authority or required third party other
          than (a) those that have been already obtained without the
          imposition of any conditions that are not acceptable to the Bank
          and that remain in effect, (b) the filing of the UCC-1 financing
          statements listed on Schedule 8.2, (c) the filing of the UCC-3
          termination statements listed on Schedule 8.2 with respect to the
          security interests of Nationsbank, National Association and (d)
          those that are disclosed by the Borrowers to the Bank prior to
          the date hereof in writing and that the Bank reasonably
          determines are not material and (e) consents under any agreement,
          bond, note or indenture referred to in Section 8.1.2(d) hereof,
          the failure of which to obtain would not create (with or without
          the giving of notice or lapse of time, or both), a default under
          or breach of such agreement, bond, note or indenture that would
          individually or in the aggregate have a Materially Adverse
          Effect. 

                    Section 8.3.  Title to Properties; Leases.  Except as
          indicated on Schedule 8.3 hereto, (a) GPC and its Subsidiaries
          own or lease all of the assets reflected in the consolidated
          balance sheet of GPC and its Subsidiaries as at the Balance Sheet
          Date or acquired since that date (except property and assets sold
          or otherwise disposed of in the course of business since that
          date), subject to no rights of others, including any mortgages,
          leases, conditional sales agreements, title retention agreements,
          liens or other encumbrances except Permitted Liens and (b) NPDC
          and its Subsidiaries own or lease all of the assets reflected in
          the consolidated balance sheet of NPDC and its Subsidiaries as at
          the Balance Sheet Date or acquired since that date (except
          property and assets sold or otherwise disposed of in the course
          of business since that date).

                    Section 8.4.  Financial Information.  

                         8.4.1.  Financial Statements.  There has been
          furnished to the Bank consolidated balance sheets of NPDC and its
          Subsidiaries and GPC and its Subsidiaries as at December 31,
          1993, and consolidated statements of operations, changes in
          stockholders' equity and cash flows of NPDC and its Subsidiaries
          and GPC and its Subsidiaries for the fiscal year then ended,
          certified by KPMG Peat Marwick, NPDC's and GPC's independent
          certified public accountants, as well as the accountants'
          management letters relating thereto.  In addition, the Borrowers
          have furnished to the Bank consolidated balance sheets of NPDC
          and its Subsidiaries and GPC and its Subsidiaries as at the
          Balance Sheet Date and consolidated statements of operations,
          changes in stockholders' equity and cash flows of NPDC and its
          Subsidiaries and GPC and its Subsidiaries for the fiscal quarter
          then ended, certified by the principal financial or accounting
          officer of NPDC and its Subsidiaries or of GPC, as the case may
          be.  All such balance sheets and statements of operations,
          changes in stockholders' equity and cash flows have been prepared
          in accordance with generally accepted accounting principles and
          fairly present, on a consolidated basis, the financial condition
          of NPDC and its Subsidiaries or GPC and its Subsidiaries, as the
          case may be, as at the close of business on the respective dates
          thereof and the results of operations for the fiscal year or
          quarter, as applicable, then ended, subject to year-end audit
          adjustments.  Except as set forth in Schedule 8.6, there were no
          direct or contingent liabilities, obligations or commitments of
          NPDC or any of its Subsidiaries or GPC or any of its Subsidiaries
          as of December 31, 1993 or as of the Balance Sheet Date involving
          material amounts, known to the officers of the Borrowers, that
          were not disclosed in the balance sheets for such dates and the
          notes related thereto that could have a Materially Adverse
          Effect.

                         8.4.2.  Projections.  The projections of the
          annual income statements and cash flow statements of NPDC and its
          Subsidiaries on a consolidated basis and on a consolidating basis
          and of GPC and its Subsidiaries on a consolidated basis and on a
          consolidating basis for the 1995 fiscal year, copies of which
          have been delivered to the Bank, disclose all assumptions used in
          formulating such projections.  As of the date hereof, to the
          knowledge of the Borrowers, no facts exist that (individually or
          in the aggregate) would result in any material change in any of
          such projections.  The projections are based upon reasonable
          estimates and assumptions, have been prepared on the basis of the
          assumptions stated therein and reflect the reasonable estimates
          of the Borrowers of the results of operations and other
          information projected therein.

                    Section 8.5.  Franchises, Patents, Copyrights, Etc. 
          Each of the Borrowers possesses all franchises, patents,
          copyrights, trademarks, trade names, licenses and permits, and
          rights in respect of the foregoing, which are required for the
          conduct of its business substantially as now conducted without
          known conflict with any rights of others.

                    Section 8.6.  Litigation.  Except as set forth on
          Schedule 8.6 hereto, there are no actions, suits, proceedings or
          investigations of any kind pending or, to the knowledge of the
          Borrowers, threatened against any of the Borrowers before any
          court, tribunal or administrative agency or board that (a) could
          reasonably be expected to have a Materially Adverse Effect, (b)
          question the validity of this Credit Agreement or any of the
          other Loan Documents, or (c) purport to materially adversely
          affect any transaction contemplated by the Loan Documents.

                    Section 8.7.  No Materially Adverse Contracts, Etc. 
          None of the Borrowers is subject to any charter, corporate or
          other legal restriction, or any judgment, decree, order, rule or
          regulation that has or is expected in the future to have a
          Materially Adverse Effect.  None of the Borrowers is a party to
          any contract or agreement that has, or in the reasonable judgment
          of such Borrower's officers, is expected to have a Materially
          Adverse Effect.

                    Section 8.8.  Compliance With Other Instruments, Laws,
          Etc.  None of the Borrowers is in violation of any provision of
          its charter documents, bylaws, or any agreement or instrument to
          which it may be subject or by which it or any of its properties
          may be bound or any decree, order, judgment (except as set forth
          on Schedule 8.6 hereto), statute, license, rule or regulation, in
          any of the foregoing cases in a manner that could reasonably be
          expected to result in a Materially Adverse Effect.

                    Section 8.9.  Tax Status.  The Borrowers (a) have made
          or filed all federal and state income and all other tax returns,
          reports and declarations required by any jurisdiction to which
          any of them is subject, (b) have paid all taxes and other
          governmental assessments and charges shown or determined to be
          due on such returns, reports and declarations, except those being
          contested in good faith and by appropriate proceedings and (c)
          have set aside on their books provisions reasonably adequate for
          the payment of all taxes for periods subsequent to the periods to
          which such returns, reports or declarations apply.  There are no
          unpaid taxes in any material amount claimed to be due by the
          taxing authority of any jurisdiction, and the officers of the
          Borrowers know of no basis for any such claim.

                    Section 8.10.  No Event of Default.  No Default or
          Event of Default has occurred and is continuing.

                    Section 8.11.  Holding Company and Investment Company
          Acts.  None of NPDC, GPC and their respective Subsidiaries is a
          "holding company", or a "subsidiary company" of a "holding
          company", or an "affiliate" of a "holding company", as such terms
          are defined in the Public Utility Holding Company Act of 1935;
          nor is any such Person an "investment company", or an "affiliated
          company" or a "principal underwriter" of an "investment company",
          as such terms are defined in the Investment Company Act of 1940.

                    Section 8.12.  Collateral.  

                    (a)  The chief executive office of each of the
          Borrowers and the office at which all of such Borrower's records
          and books of account are kept are as set forth on Schedule
          8.12(a) hereto or such other location of which 30 days prior
          written notice is given to the Bank.

                    (b)  Except with respect to Permitted Liens, there is
          no financing statement, security agreement, chattel mortgage,
          real estate mortgage or other document filed or recorded with any
          filing records, registry or other public office, that purports to
          cover, affect or give notice of any present or possible future
          lien on, or security interest in (i) in the case of any GPC
          Borrower, any assets or property of any GPC Borrower or any
          rights relating thereto and (ii) in the case of NPDC, any NPDC
          Collateral or any rights relating thereto.

                    (c)  The names under which the Borrowers transact
          business, as of the date hereof, are listed on Schedule 8.12(c)
          hereto, by corporate entity and with an indication as to the
          locations at which, as of the date hereof, each Borrower uses
          each such name.  Except as set forth on Schedule 8.12(c), none of
          the Borrowers has within the six-year period immediately
          preceding the date of this Agreement changed its name, been the
          surviving entity of a merger or consolidation, or acquired all or
          substantially all of the assets of any person.  Each Borrower
          will not change its name without providing at least 30 days'
          prior written notice to the Bank.

                    Section 8.13.  Perfection of Security Interest.  All
          filings, assignments, pledges and deposits of documents or
          instruments have been made and all other actions have been taken
          that are necessary or advisable, under Applicable Law, to
          establish and perfect the Bank's security interest in the
          Collateral (other than the filing by Nationsbank, National
          Association of the UCC-3 Termination statements listed on
          Schedule 8.2 and other than the filing of the UCC-1 financing
          statements listed on Schedule 8.2).  The Collateral and the
          Bank's rights with respect to the Collateral are not subject to
          any setoff, claims, withholdings or other defenses (other than
          those that could not, singly or in the aggregate, be expected to
          have a Materially Adverse Effect or those with respect to the
          security interest of Nationsbank, National Association prior to
          the filing of UCC-3 termination statements listed on Schedule 8.2
          with respect thereto).  NPDC is the registered owner or
          authorized holder of the NPDC Collateral, free from any lien,
          security interest, encumbrance and any other claim or demand,
          except for Liens of the nature permitted under Sections 10.2(ii)
          and 10.2(iv) hereunder which attach to the general assets of
          NPDC.  The GPC Borrowers are the owners of the GPC Collateral
          free from any lien, security interest, encumbrance and any other
          claim or demand, except for Liens permitted under Sections
          10.2(ii) and 10.2(iv) which attach to the general assets of any
          GPC Borrower.

                    Section 8.14.  Employee Benefit Plans.  

                         8.14.1.  In General.  Each Employee Benefit Plan
          has been maintained and operated in compliance in all material
          respects with the provisions of ERISA and, to the extent
          applicable, the Code, including but not limited to the provisions
          thereunder respecting prohibited transactions.  The Borrowers
          have heretofore delivered to the Bank the most recently completed
          annual report, Form 5500, with all required attachments, and
          actuarial statement required to be submitted under Section 103(d)
          of ERISA, with respect to each Guaranteed Pension Plan.

                         8.14.2.  Terminability of Welfare Plans.  Under
          each Employee Benefit Plan that is an employee welfare benefit
          plan within the meaning of Section 3(1) or Section 3(2)(B) of
          ERISA, no benefits are due unless the event giving rise to the
          benefit entitlement occurs prior to plan termination (except as
          required by Title I, Part 6 of ERISA).  The Borrowers or an ERISA
          Affiliate, as appropriate, may terminate each such Plan at any
          time (or at any time subsequent to the expiration of any
          applicable bargaining agreement) in the discretion of the
          Borrowers or such ERISA Affiliate without liability to any
          Person.

                         8.14.3.  Guaranteed Pension Plans.  Each
          contribution required to be made to a Guaranteed Pension Plan,
          whether required to be made to avoid the incurrence of an
          accumulated funding deficiency, the notice or lien provisions of
          Section 302(f) of ERISA, or otherwise, has been timely made.  No
          waiver of an accumulated funding deficiency or extension of
          amortization periods has been received with respect to any
          Guaranteed Pension Plan.  No liability to the PBGC (other than
          required insurance premiums, all of which have been paid) has
          been incurred by the Borrowers or any ERISA Affiliate with
          respect to any Guaranteed Pension Plan and there has not been any
          ERISA Reportable Event, or any other event or condition that
          presents a material risk of termination of any Guaranteed Pension
          Plan by the PBGC.  Except as set forth on Schedule 8.14, based on
          the latest valuation of each Guaranteed Pension Plan (which in
          each case occurred within twelve months of the date of this
          representation), and on the actuarial methods and assumptions
          employed for that valuation, the aggregate benefit liabilities of
          all such Guaranteed Pension Plans within the meaning of Section
          4001 of ERISA did not exceed the aggregate value of the assets of
          all such Guaranteed Pension Plans, disregarding for this purpose
          the benefit liabilities and assets of any Guaranteed Pension Plan
          with assets in excess of benefit liabilities.

                         8.14.4.  Multiemployer Plans.  Neither the
          Borrowers nor any ERISA Affiliate has incurred any material
          liability (including secondary liability) to any Multiemployer
          Plan as a result of a complete or partial withdrawal from such
          Multiemployer Plan under Section 4201 of ERISA or as a result of
          a sale of assets described in Section 4204 of ERISA.  Neither the
          Borrowers nor any ERISA Affiliate has been notified that any
          Multiemployer Plan is in reorganization or insolvent under and
          within the meaning of Section 4241 or Section 4245 of ERISA or
          that any Multiemployer Plan intends to terminate or has been
          terminated under Section 4041A of ERISA.

                    Section 8.15.  Regulations G, U and X.   The Borrowers
          have complied with all of the requirements and provisions of
          Regulations G, U and X as to which the Borrowers are required to
          comply in connection herewith.  No portion of any Revolving
          Credit Loan is to be used, and no portion of any Letter of Credit
          is to be obtained, for the purpose of "purchasing" or "carrying"
          any "margin security" or "margin stock" as such terms are used in
          Regulations G, U and X of the Board of Governors of the Federal
          Reserve System as now and from time to time hereafter in effect.

                    Section 8.16.  Environmental Compliance.  The Borrowers
          have taken all necessary steps to investigate their past and
          present usage of the Real Estate owned or leased by the Borrowers
          and the operations conducted thereon commencing with their
          purchase or lease thereof, as well as, in the case of any fee
          interest in Real Estate that may be acquired by any of the
          Borrowers after the Closing Date, the past and present condition
          and usage thereof and the operations conducted thereon and, based
          upon such diligent investigation, has determined that:

                    (a)  none of the Borrowers or any operator of the Real
               Estate or any operations thereon is in violation, or alleged
               violation, of any judgment, decree, order, law, license,
               rule or regulation pertaining to environmental matters,
               including without limitation, those arising under the
               Resource Conservation and Recovery Act ("RCRA"), the
               Comprehensive Environmental Response, Compensation and
               Liability Act of 1980 as amended ("CERCLA"), the Superfund
               Amendments and Reauthorization Act of 1986 ("SARA"), the
               Federal Clean Water Act, the Federal Clean Air Act, the
               Toxic Substances Control Act, or any state or local statute,
               regulation, ordinance, order or decree relating to health,
               safety or the environment (hereinafter "Environmental
               Laws"), which violation would have a Materially Adverse
               Effect;

                    (b)  none of the Borrowers has received notice from any
               third party including, without limitation: any federal,
               state or local governmental authority, (i) that any one of
               them has been identified by the United States Environmental
               Protection Agency ("EPA") as a potentially responsible party
               under CERCLA with respect to a site listed on the National
               Priorities List, 40 C.F.R. Part 300 Appendix B (1986); (ii)
               that any hazardous waste, as defined by 42 U.S.C.  Section
               9601(5), any hazardous substances as defined by 42 U.S.C.
               Section 9601(14), any pollutant or contaminant as defined by
               42 U.S.C. Section 9601(33) and any toxic substances, oil or
               hazardous materials or other chemicals or substances
               regulated by amy Environmental Laws ("Hazardous Substances")
               that any one of them has generated, transported or disposed
               of has been found at any site at which a federal, state or
               local agency or other third party has conducted or has
               ordered that any of the Borrowers conduct a remedial
               investigation, removal or other response action pursuant to
               any Environmental Law; or (iii) that it is or shall be a
               named party to any claim, action, cause of action,
               complaint, or legal or administrative proceeding (in each
               case, contingent or otherwise) arising out of any third
               party's incurrence of costs, expenses, losses or damages of
               any kind whatsoever in connection with the release of
               Hazardous Substances;

                    (c)  except as set forth on Schedule 8.16 attached
               hereto: (i) no portion of the purchased or leased Real
               Estate has been used from and after the Borrowers' purchase
               or lease thereof and no portion of any fee interest in Real
               Estate that may be acquired by any of the Borrowers after
               the Closing Date has at any time been used for the handling,
               processing, storage or disposal of Hazardous Substances
               except in accordance with applicable Environmental Laws; and
               no underground tank or other underground storage receptacle
               for Hazardous Substances is located on any portion of the
               Real Estate; (ii) in the course of any activities conducted
               by the Borrowers or operators of its properties, no
               Hazardous Substances have been generated or are being used
               on the Real Estate except in accordance with applicable
               Environmental Laws; (iii) there have been no releases (i.e.
               any past or present releasing, spilling, leaking, pumping,
               pouring, emitting, emptying, discharging, injecting,
               escaping, disposing or dumping) or threatened releases of
               Hazardous Substances on, upon, into or from the properties
               of the Borrowers, which releases would have a material
               adverse effect on the value of any of the Real Estate or
               adjacent properties or the environment; (iv) to the best of
               the Borrowers' knowledge, there have been no releases on,
               upon, from or into any real property in the vicinity of any
               fee interest in Real Estate that may be acquired by any of
               the Borrowers after the Closing Date that, through soil or
               groundwater contamination, may have come to be located on,
               and which would have a material adverse effect on the value
               of, such Real Estate; and (v) in addition, any Hazardous
               Substances that have been generated on any of the leased
               Real Estate from and after the Borrowers' lease thereof or
               on any fee interest in Real Estate that may be acquired by
               any of the Borrowers after the Closing Date have been
               transported offsite only by carriers having an
               identification number issued by the EPA, treated or disposed
               of only by treatment or disposal facilities maintaining
               valid permits as required under applicable Environmental
               Laws, which transporters and facilities have been and are,
               to the best of the Borrowers' knowledge, operating in
               compliance with such permits and applicable Environmental
               Laws; and

                    (d)  None of the Borrowers or any Real Estate is
               subject to any applicable environmental law requiring the
               performance of Hazardous Substances site assessments, or the
               removal or remediation of Hazardous Substances, or the
               giving of notice to any governmental agency or the recording
               or delivery to other Persons of an environmental disclosure
               document or statement by virtue of the transactions set
               forth herein and contemplated hereby, or as a condition to
               the effectiveness of any other transactions contemplated
               hereby.

                    Section 8.17.  Subsidiaries, Etc.  Each of the
          Subsidiaries of NPDC and GPC existing on the date hereof are set
          forth on Schedule 8.17 hereto.  Except as set forth on Schedule
          8.17, each of NPDC, GPC, and each Subsidiary of GPC is not on the
          date hereof engaged in any joint venture or partnership with any
          other Person.

                    Section 8.18.  Capitalization; Ownership of GPC's
          Subsidiaries.  The authorized capital stock and the number of
          shares outstanding on the date hereof of each of NPDC's and GPC's
          Subsidiaries and the names of each such Subsidiary's non-public
          shareholders (together with an indication of the number of shares
          each holds) are set forth on Schedule 8.18 hereto.  All of such
          outstanding shares on the date hereof are duly issued, fully paid
          and non-assessable.  NPDC has pledged 3,349,088 shares of GPC
          common stock of which NPDC is the registered owner, and all
          dividends thereto, and 2,300,937 shares of the common stock of
          which NPDC is the registered owner in GTS Duratek, Inc., to the
          Bank pursuant to the Pledge Agreement.

                    Section 8.19.  Disclosure.  No representation or
          warranty made by any of the Borrowers in this Credit Agreement or
          in any agreement, instrument, document, certificate, written
          statement or letter furnished to the Bank by or on behalf of any
          of the Borrowers in connection with any of the transactions
          contemplated by the Loan Documents, at the time such
          representation was made, contained any untrue statement of a
          material fact or omitted to state a material fact in order to
          make the statements contained therein not misleading in light of
          the circumstances in which they were made.

                    Section 8.20.  Labor Relations.  On the date hereof,
          none of the Borrowers has any labor contracts or agreements.  To
          the best of the Borrowers' knowledge after diligent inquiry and
          except for the Employment Litigation, the labor relations between
          the Borrowers and their respective employees are satisfactory,
          and there is no indication of any strike, work stoppage or other
          labor problem involving the business of the Borrowers which would
          have a Materially Adverse Effect.


                                      ARTICLE IX

                        AFFIRMATIVE COVENANTS OF THE BORROWERS

                    NPDC covenants and agrees (on behalf of and with
          respect to itself and for so long as the Term Loan or the Term
          Note is outstanding) and each of the GPC Borrowers covenants and
          agrees (on behalf of and with respect to itself and the other GPC
          Borrowers and for so long as the Revolving Credit Note, any
          Revolving Credit Loan, Reimbursement Obligation or Letter of
          Credit is outstanding or the Revolving Credit Commitment has not
          been terminated) as follows:

                    Section 9.1.  Punctual Payment.  

                         9.1.1.  NPDC Punctual Payment.  NPDC will duly and
          punctually pay or cause to be paid the principal and interest on
          the Term Loan, the closing fee, all costs, expenses and all other
          amounts due and payable by NPDC under this Credit Agreement and
          the other Loan Documents to which NPDC is a party, all in
          accordance with the terms of this Credit Agreement and such other
          Loan Documents.

                         9.1.2.  Punctual Payments.  The GPC Borrowers,
          jointly and severally, will duly and punctually pay or cause to
          be paid the principal and interest on the Revolving Credit Loans,
          all Reimbursement Obligations, the Letter of Credit Fees, the
          commitment fees, all costs, expenses and all other amounts due
          and payable by the GPC Borrowers under this Credit Agreement and
          the other Loan Documents to which any GPC Borrower is a party,
          all in accordance with the terms of this Credit Agreement and
          such other Loan Documents.

                    Section 9.2.  Maintenance of Offices; Names.  NPDC will
          maintain its chief executive offices at 9 West 57th Street, New
          York, New York 10019 and each of the GPC Borrowers will maintain
          their chief executive offices at 6700 Alexander Bell Drive,
          Columbia, Maryland 21046 or at such other place in the United
          States of America as the applicable Borrower shall designate upon
          not less than thirty (30) days' prior written notice to the Bank.

          Each of the Borrowers will maintain its name and provide the Bank
          with not less than thirty days' prior written notice of any
          change of its name.

                    Section 9.3.  Records and Accounts.  Each of the
          Borrowers and its Subsidiaries will (a) keep true and accurate
          records and books of account, and maintain duplicate books and
          records, which may be retained in electronic form or on other
          data processing media and which shall be updated not less
          frequently than monthly, at an alternate off-site location (in a
          fire-proof facility) in which accurate and complete entries will
          be made in accordance with generally accepted accounting
          principles and (b) maintain adequate accounts and reserves for
          all taxes (including income taxes), depreciation, depletion,
          obsolescence and amortization of its properties, contingencies,
          and other reserves.

                    Section 9.4.  Financial Statements, Certificates and
          Information.  NPDC or GPC, as the case may be, will deliver to
          the Bank:

                    (a)  as soon as practicable, but in any event not later
               than one hundred and five (105) days after the end of each
               fiscal year of NPDC and GPC, (i) NPDC's and GPC's Annual
               Report on Form 10-K for such fiscal year as filed with the
               Securities and Exchange Commission and (ii) the consolidated
               balance sheet of NPDC and its Subsidiaries and of GPC and
               its Subsidiaries and the consolidating balance sheet of NPDC
               and its Subsidiaries and of GPC and its Subsidiaries, each
               as at the end of such year, and the related consolidated
               statements of operations, changes in stockholders' equity
               and cash flow and consolidating statements of operations,
               changes in stockholders' equity and cash flow for such year,
               each setting forth in comparative form the figures for the
               previous fiscal year and all such consolidated and
               consolidating statements to be in reasonable detail,
               prepared in accordance with generally accepted accounting
               principles, and (in the case of the consolidated statements)
               certified without qualification by KPMG Peat Marwick or by
               other independent certified public accountants satisfactory
               to the Bank, together with (A) a written statement from such
               accountants to the effect that in making the examination
               necessary to said certification, they have obtained no
               knowledge that the Borrowers failed to comply with the
               terms, covenants, provisions or conditions of Article X or
               Article XI hereof insofar as such Articles relate to
               accounting matters or, if such accountants shall have
               obtained knowledge of such failure, they shall disclose the
               failure in such statement; provided, that such accountants
               shall not be liable to the Bank for failure to obtain such
               knowledge, and (B) the accountants' management letters
               relating thereto;

                    (b)  as soon as practicable, but in any event not later
               than thirty (30) days after the end of each fiscal year of
               NPDC and GPC, the annual business plan of NPDC and of the
               GPC Borrowers and forecasts and projections prepared by the
               management of the Borrowers, in each case in form and detail
               reasonably satisfactory to the Bank, of consolidated and
               consolidating balance sheets and related statements of
               operations, changes in stockholders' equity and cash flow on
               an annual basis for each of the following two fiscal years;

                    (c)  as soon as practicable, but in any event not later
               than forty-five (45) days after the end of each of the first
               three (3) fiscal quarters of NPDC and GPC (i) NPDC's and
               GPC's Quarterly Report on Form 10-Q for such fiscal quarter
               as filed with the Securities and Exchange Commission and
               (ii) copies of the unaudited consolidated balance sheet of
               NPDC and its Subsidiaries and of GPC and its Subsidiaries
               and the unaudited consolidating balance sheet of NPDC and
               its Subsidiaries and of GPC and its Subsidiaries, each as at
               the end of such quarter, and the related consolidated
               statements of operations, changes in stockholders' equity
               and cash flow and consolidating statements of operations,
               changes in stockholders' equity and cash flow for the
               portion of NPDC's or GPC's, as the case may be, fiscal year
               then elapsed, as well as a backlog report for each of the
               GPC Borrowers' business segments, all in reasonable detail
               and prepared in accordance with generally accepted
               accounting principles, together with a certification by the
               principal financial or accounting officer of NPDC or GPC, as
               the case may be, that the information contained in such
               financial statements and reports fairly presents the
               financial position of NPDC and its Subsidiaries or GPC and
               its Subsidiaries, as the case may be, on the date thereof
               (subject to year-end adjustments);

                    (d)  as soon as it is available, but in any event not
               later than thirty (30) days after the end of each of the
               fiscal quarters of GPC, a copy of the quarterly business
               report for such fiscal quarter in the form as is currently
               prepared by GPC or such other form as is reasonably
               acceptable to the Bank;

                    (e)  simultaneously with the delivery of the financial
               statements referred to in subsections (a) and (c) above, a
               statement certified by the principal financial or accounting
               officer of GPC in substantially the form of Exhibit H-1
               hereto, (i) setting forth in reasonable detail computations
               evidencing compliance with the covenants contained in
               Sections 10.14 through 10.18 and (if applicable)
               reconciliations to reflect changes in generally accepted
               accounting principles since the Balance Sheet Date and (ii)
               stating that to the best of such officer's knowledge, after
               due inquiry, no Default or Event of Default has occurred
               with respect to any GPC Borrower and, if so, whether such
               Default or Event of Default is continuing (the "GPC
               Compliance Certificate") and a statement certified by the
               principal financial or accounting officer of NPDC in
               substantially the form of Exhibit H-2 hereto, (i) setting
               forth in reasonable detail computations evidencing
               compliance with the covenants contained in Sections 11.7
               through 11.10 and (if applicable) reconciliations to reflect
               changes in generally accepted accounting principles since
               the Balance Sheet Date and (ii) stating that to the best of
               such officer's knowledge, after due inquiry, no Default or
               Event of Default has occurred with respect to NPDC and, if
               so, whether such Default or Event of Default is continuing
               (the "NPDC Compliance Certificate");

                    (f)  within twenty-five (25) days after the end of each
               calendar month or, after the occurrence and during the
               continuance of a Default or Event of Default, at such other
               times as the Bank may request, a Borrowing Base Report
               setting forth the Borrowing Base as at the end of such
               calendar month or other date so requested by the Bank, in
               each case accompanied by a statement certified by the
               principal financial or accounting officer of GPC stating
               that the Borrowing Base Report complies with the terms of
               this Credit Agreement;

                    (g)  within twenty-five (25) days after the end of each
               calendar month, an Accounts Receivable aging report,
               certified by the principal financial or accounting officer
               of GPC;

                    (h)  to the extent not otherwise required to be
               delivered to the Bank pursuant to Section 9.4(a)(i) or
               Section 9.4(c)(i), contemporaneously with the filing or
               mailing thereof, copies of all material of a financial
               nature filed with the Securities and Exchange Commission by
               NPDC or GPC or sent to the stockholders of NPDC or GPC; and

                    (i)  from time to time such other business and
               financial data and information (including, without
               limitation, accountants' management letters) as the Bank may
               reasonably request.

                    Section 9.5.  Notices.  

                         9.5.1.  Defaults.  The Borrowers will promptly
          notify the Bank in writing of the occurrence of any Default or
          Event of Default.  

                         9.5.2.  Environmental Events.  Each Borrower will
          promptly give notice to the Bank (a) of any violation of any
          Environmental Law that such Borrower or any of its Subsidiaries
          reports in writing or is reportable by such Borrower in writing
          (or for which any written report supplemental to any oral report
          is made) to any federal, state or local environmental agency and
          (b) upon becoming aware thereof, of any inquiry, proceeding,
          investigation, or other action, including a notice from any
          agency of potential environmental liability, or any federal,
          state or local environmental agency or board, that, in the case
          of either clause (a) or (b) above, has the potential to have a
          Materially Adverse Effect or materially adversely affect the
          Bank's security interests pursuant to the Security Documents.

                         9.5.3.  Notification of Claims Against Collateral.

          Each Borrower will, promptly upon becoming aware thereof, notify
          the Bank in writing of any setoff, claims, withholdings or other
          defenses to which any of the Collateral, or the Bank's rights
          with respect to the Collateral, are subject; provided, that with
          respect to the GPC Borrowers, such notice shall only be required
          if the aggregate amount of such setoffs, claims, withholdings or
          other defenses (i) causes the Available Credit to be less than $0
          or (ii) equals or exceeds $250,000.

                         9.5.4.  Notice of Litigation and Judgments.  NPDC
          or GPC, as the case may be, will give notice to the Bank in
          writing within fifteen (15) days of becoming aware of any
          litigation or proceedings threatened in writing or any pending
          litigation and proceedings affecting NPDC or any of its
          Subsidiaries or GPC or any of its Subsidiaries or to which any
          such entity is or becomes a party involving an uninsured claim
          against NPDC or any of its Subsidiaries or GPC or any of its
          Subsidiaries that could reasonably be expected to have a
          Materially Adverse Effect and stating the nature and status of
          such litigation or proceedings.  Such notice will be given to the
          Bank, in writing, in form and detail satisfactory to the Bank,
          within ten (10) days of any judgment not covered by insurance,
          final or otherwise, against NPDC or any of its Subsidiaries or
          GPC or any of its Subsidiaries in an amount in excess of
          $250,000.

                         9.5.5.  Notice of Amendments to Certain Documents.
          If (and on each occasion that) any of the charter or other
          incorporation documents or by-laws of any of NPDC or its
          Subsidiaries or GPC or its Subsidiaries shall at any time be
          modified or amended in any respect whatever or if any new filings
          of any such documents shall at any time take place, then NPDC or
          GPC, as the case may be, shall, not later than ten (10) days
          prior to the date on which any such modification, amendment,
          supplement or new filing shall first become effective, furnish to
          the Bank a true and complete copy of such modification,
          amendment, supplement or new filing.

                         9.5.6.  Notice of Certain Other Events.  Each
          Borrower will, immediately upon becoming aware thereof, notify
          the Bank of any material change in the operations of such
          Borrower which could reasonably be expected to have a Material
          Adverse Effect, including, without limitation, (a) the cessation
          of operations at any facility of any of the foregoing that shall
          continue for a period of five (5) days of more which could
          reasonably be expected to have a Material Adverse Effect, (b) the
          consolidation of any of such facilities which could reasonably be
          expected to have a Material Adverse Effect, (c) any strike, work
          stoppage or other material labor relations problem involving any
          of the foregoing which could reasonably be expected to have a
          Material Adverse Effect and (d) the start-up of any new
          operations of any of the foregoing commencing after the Closing
          Date which could reasonably be expected to have a Material
          Adverse Effect.

                    9.5.7  Notice under Pledge Agreement.  GPC will notify
          the Bank promptly in writing of the occurrence of any events
          described in paragraph 7(a) of the Pledge Agreement.

                    Section 9.6.  Corporate Existence; Maintenance of
          Properties.  Except as permitted by Section 10.5.1 in the case of
          the GPC Borrowers and Section 11.3, in the case of NPDC, each of
          the Borrowers will do or cause to be done all things necessary to
          preserve and keep in full force and effect its corporate
          existence, rights and franchises, except if no Materially Adverse
          Effect results from the loss of such rights or franchises.  Each
          of the Borrowers (a) will cause all of its properties which are
          necessary in the conduct of its business to be maintained and
          kept in reasonably good condition, repair and working order and
          supplied with all necessary equipment, (b) will cause to be made
          all necessary repairs, renewals, replacements, betterments and
          improvements thereof, but only as in the judgment of the
          Borrowers may be necessary so that the business carried on in
          connection therewith may be properly and advantageously conducted
          at all times, and (c) will continue to engage primarily in the
          businesses now conducted by them and in related businesses;
          provided, that nothing in this Section 9.6 shall prevent any of
          the Borrowers from discontinuing the operation and maintenance of
          any of its properties and disposing of same if such
          discontinuance, or discontinuance and disposition, is, in the
          judgment of such Borrowers, desirable in the conduct of its or
          their business and all such discontinuances, or discontinuances
          and dispositions, do not in the aggregate have a Materially
          Adverse Effect.

                    Section 9.7.  Insurance.  

                         9.7.1.  General.  Each of the Borrowers will
          maintain with financially sound and reputable insurers insurance
          with respect to its properties and business against such
          casualties and contingencies as shall be in accordance with the
          general practices of businesses engaged in similar activities in
          similar geographic areas and in amounts, containing such terms,
          in such forms and for such periods as may be reasonable and
          prudent and will not result in any Borrower being deemed a
          co-insurer under applicable insurance laws, regulations and
          policies.  Without limiting the foregoing, each of the Borrowers
          shall:

                    (a)  keep all of its physical property insured against
               fire and extended coverage risks in amounts and with
               deductibles equal to those generally maintained by
               businesses of similar size engaged in similar activities in
               similar geographic areas;

                    (b)  maintain all such workers' compensation or similar
               insurance as may be required by law; and

                    (c)  maintain, in amounts and with deductibles equal to
               those generally maintained by businesses of similar size
               engaged in similar activities in similar geographic areas,
               general public liability insurance against claims for bodily
               injury, death or property damage occurring on, in or about
               the properties of such Borrower, business interruption
               insurance and product liability insurance.

                         9.7.2.  Notice of Cancellation, Etc.  In the event
          of failure by NPDC or the GPC Borrowers, as the case may be, to
          provide and maintain insurance as herein provided, the Bank may,
          at its option, after five days notice, provide such insurance and
          charge the amount thereof (which shall constitute a NPDC
          Obligation or a GPC Obligation, as applicable) to NPDC or the GPC
          Borrowers, as the case may be.  Upon five days notice, the
          Borrowers shall furnish the Bank with certificates of insurance
          and, as promptly as possible, policies evidencing compliance with
          the foregoing insurance provisions.

                    Section 9.8.  Taxes.  Each of the Borrowers will duly
          pay and discharge, or cause to be paid and discharged, before the
          same shall become overdue, all taxes, assessments and other
          governmental charges imposed upon it and its real properties,
          sales and activities, or any part thereof, or upon the income or
          profits therefrom, as well as all claims for labor, materials, or
          supplies that if unpaid might by law become a lien or charge upon
          any of its property; provided, that any such tax, assessment,
          charge, levy or claim need not be paid if the validity or amount
          thereof shall currently be contested in good faith by appropriate
          proceedings and if such Borrower shall have set aside on its
          books adequate reserves with respect thereto; and provided,
          further, that such Borrower will pay all such taxes, assessments,
          charges, levies or claims forthwith upon the commencement of
          proceedings to foreclose any lien that may have attached as
          security therefor.

                    Section 9.9.  Inspection of Properties and Books, Etc. 

                         9.9.1.  General.  Each of the Borrowers shall
          permit the Bank, through its designated representatives, to visit
          and inspect any of the properties of such Borrower, to examine
          the books of account of such Borrower (and to make copies thereof
          and extracts therefrom), and to discuss the affairs, finances and
          accounts of such Borrower with, and to be advised as to the same
          by, its and their officers, all at such reasonable times (during
          normal business hours and on prior notice) and intervals as the
          Bank may reasonably request.

                         9.9.2.  Bank Audits.  At any time and from time to
          time, upon the reasonable request of the Bank, with prior notice
          and during normal business hours, the Bank may conduct audits
          with respect to the Accounts Receivable to verify whether or not
          the information set forth in the Borrowing Base Report most
          recently delivered is accurate and complete in all material
          respects based upon a review by such auditors of the Accounts
          Receivable (including verification with respect to the amount,
          aging, identity and credit of the respective account debtors and
          the billing practices of GPC).  All such Bank audits shall be
          conducted by the Bank and made at the expense of the GPC
          Borrowers, jointly and severally; provided, that the GPC
          Borrowers shall bear the expense (without duplication of any
          expense incurred pursuant to Section 9.9.1) of no more than two
          Bank audits per GPC Borrower during any twelve month period
          (excluding Bank audits after the occurrence of and during the
          continuance of a Default or Event of Default which shall in each
          case be at the expense of the GPC Borrowers, jointly and
          severally).

                         9.9.3.  Communications with Accountants.  Each of
          the Borrowers authorizes the Bank to communicate directly with
          such Borrower's independent certified public accountants and
          authorizes such accountants to disclose to the Bank any and all
          financial statements and other supporting financial documents and
          schedules including copies of any management letter with respect
          to the business, financial condition and other affairs of such
          Borrower.  At the request of the Bank, the Borrowers shall
          deliver a letter addressed to such accountants instructing them
          to comply with the provisions of this Section 9.9.3.

                    Section 9.10.  Compliance with Laws, Contracts,
          Licenses, and Permits.  Each of the Borrowers will comply in all
          material respects with (a) Applicable Laws wherever its business
          is conducted, including all Environmental Laws and applicable
          provisions of ERISA, except for noncompliance that would not,
          singly or in the aggregate, have a Materially Adverse Effect, (b)
          the provisions of its charter documents and by-laws, (c) all
          agreements and instruments by which it or any of its properties
          may be bound, except for noncompliance that would not, singly or
          in the aggregate, have a Materially Adverse Effect, and (d) all
          applicable decrees, orders, and judgments except for
          non-compliance that would not singly or in the aggregate have a
          Materially Adverse Effect.  If any authorization, consent,
          approval, permit or license from any officer, agency or
          instrumentality of any government shall become necessary or
          required in order that any of the Borrowers may conduct its
          business as it is now being conducted or any of the Borrowers may
          fulfill any of its obligations hereunder or under any of the
          other Loan Documents to which such Borrower is a party, each of
          the Borrowers will immediately take or cause to be taken all
          reasonable steps within the power of such Borrower to obtain such
          authorization, consent, approval, permit or license and furnish
          the Bank with evidence thereof except if no Materially Adverse
          Effect would result from failure to obtain the foregoing.

                    Section 9.11.  Employee Benefit Plans.  Each of the
          Borrowers will (a) upon request of the Bank, furnish to the Bank
          a copy of the most recent actuarial statement required to be
          submitted under Section 103(d) of ERISA and Annual Report, Form
          5500, with all required attachments, in respect of each
          Guaranteed Pension Plan and (b) promptly upon receipt or
          dispatch, furnish to the Bank any notice, report or demand sent
          or received in respect of a Guaranteed Pension Plan under
          Sections 302, 4041, 4042, 4043, 4063, 4065, 4066 and 4068 of
          ERISA, or in respect of a Multiemployer Plan, under Section
          4041A, 4202, 4219, 4242 or 4245 of ERISA.

                    Section 9.12.  Use of Proceeds.  NPDC will use the
          proceeds of the Term Loans solely for the partial repayment of
          certain Swiss Franc denominated long-term debt of NPDC due in
          1995 and 1996 and for reimbursement to NPDC of amounts previously
          paid by NPDC in 1995 for such purpose.  The GPC Borrowers will
          use the proceeds of the Revolving Credit Loans solely for working
          capital purposes and other purposes not prohibited by this
          Agreement.  The GPC Borrowers will obtain Letters of Credit
          solely for use in the ordinary course of business.

                    Section 9.13.  Bank Accounts.  NPDC will, together with
          the employees, agents and other Persons acting on behalf of NPDC,
          receive and hold in trust for the Bank all payments constituting
          proceeds of NPDC Collateral that come into their possession or
          under their control and, immediately upon receipt thereof,
          deposit such payments in the form received, with any appropriate
          endorsements, in the collateral account of the Bank created
          pursuant to the Pledge Agreement.

                    Section 9.14.  Further Assurances.  Each of the
          Borrowers will cooperate with the Bank and execute such further
          instruments and documents as the Bank shall reasonably request to
          carry out to their satisfaction the transactions contemplated by
          this Credit Agreement and the other Loan Documents.  Without in
          any way limiting the foregoing, each of the Borrowers will
          execute, acknowledge and deliver any and all such further
          assurances and other assignments, consents, waivers, stock
          powers, incumbency certificates, affidavits, agreements or
          instruments, and take or cause to be taken all such other action
          as shall be reasonably requested by the Bank (including, without
          limitation, compliance with the Assignment of Claims Act as
          provided in the Security Agreements) from time to time in order
          to give full effect to any of the Security Documents or in order
          to maintain, preserve, perfect, safeguard and continue in full
          force and effect at all times all or any of the rights, remedies,
          powers and privileges of the Bank under or in respect of any of
          the Security Documents or any of the Collateral, including,
          without limitation, all steps necessary to perfect and maintain a
          security interest in any Collateral that requires special
          filings, all without any cost or expense to the Bank.
           
                    Section 9.15.  Dividend Payments.  GPC may, at such
          times and in such amounts as is consistent with the fiduciary
          duties of the GPC Board of Directors and GPC's historical
          practice and with Applicable Law, declare and pay cash dividends
          in respect of its common stock.

                    Section 9.16.  Loans to NPDC and the Foreign
          Subsidiaries.  All loans or other extensions of credit to NPDC or
          the Foreign Subsidiaries made by GPC shall be evidenced (a) in
          the case of NPDC, by a promissory note of NPDC in substantially
          the form of Exhibit A-3 and (b) in the case of the Foreign
          Subsidiaries, by a promissory note in form and substance
          reasonably satisfactory to the Bank; the promissory note of NPDC
          shall be pledged to the Bank pursuant to the GPC Note Pledge
          Agreement and the promissory note of the Foreign Subsidiaries
          shall be pledged to the Bank pursuant to a pledge agreement in
          form and substance reasonably satisfactory to the Bank.


                                      ARTICLE X

                   CERTAIN NEGATIVE COVENANTS OF THE GPC BORROWERS

                    Each of the GPC Borrowers covenants and agrees (on
          behalf of and with respect to itself and the other GPC Borrowers
          and for so long as the Revolving Credit Note, any Revolving
          Credit Loan, Reimbursement Obligation or Letter of Credit is
          outstanding or the Revolving Credit Commitment has not been
          terminated) as follows:

                    Section 10.1.  Restrictions on Indebtedness.  Each of
          the GPC Borrowers will not create, incur, assume, guarantee or be
          or remain liable, contingently or otherwise, with respect to any
          Indebtedness other than:

                    (a)  Indebtedness to the Bank arising under any of the
          Loan Documents;

                    (b)  current liabilities of such Borrower incurred in
          the ordinary course of business not incurred through (i) the
          borrowing of money, or (ii) the obtaining of credit except for
          credit on an open account basis customarily extended and in fact
          extended in connection with purchases of goods and services;

                    (c)  Indebtedness in respect of taxes, assessments,
          governmental charges or levies and claims for labor, materials
          and supplies to the extent that payment therefor shall not at the
          time be required to be made in accordance with the provisions of
          Section 9.8;

                    (d)  Indebtedness in respect of judgments or awards
          that do not constitute an Event of Default under Section 14.1(j);

                    (e)  endorsements for collection, deposit or
          negotiation and warranties of products or services, in each case
          incurred in the ordinary course of business;

                    (f)  the Subordinated Debt;

                    (g)  obligations under Capitalized Leases and
          Indebtedness incurred in connection with the acquisition of any
          real or personal property by such Borrower, provided, that (i)
          the aggregate principal amount of such Indebtedness of the GPC
          Borrowers incurred in any fiscal year shall not exceed $300,000
          and (ii) the aggregate principal amount of such Indebtedness of
          the GPC Borrowers shall not exceed the aggregate amount of
          $900,000 at any one time outstanding;

                    (h)  performance or other guaranties given by any GPC
          Borrower in respect of Indebtedness of the other GPC Borrowers
          that is otherwise permitted pursuant to this Section 10.1 and in
          respect of other obligations of the other GPC Borrowers permitted
          under this Agreement;

                    (i)  Indebtedness existing on the date hereof and
          listed and described on Schedule 10.1(i) or Schedule 10.3(d)
          hereto;

                    (j)  Indebtedness of any of the GPC Borrowers to any
          other GPC Borrower and Indebtedness of either Foreign Subsidiary
          existing on the date hereof to any GPC Borrower or as
          contemplated by subsection 2.1;

                    (k)  Indebtedness not otherwise permitted under this
          Section 10.1 (other than to the Foreign Subsidiaries, to the
          Joint Venture or to the joint venture referred to in Schedule
          10.1(n)) in aggregate principal amount not to exceed $100,000 at
          any one time outstanding;

                    (l)  Indebtedness in respect of deferred liabilities
          other than for deferred taxes and other than for borrowed money,
          including without limitation, deferred compensation, provided,
          that the aggregate amount of such Indebtedness of the GPC
          Borrowers incurred on or after the date hereof shall not exceed
          $500,000 at any one time outstanding;

                    (m)  Indebtedness in respect of deferred taxes other
          than for borrowed money; and

                    (n)  Indebtedness described on Schedule 10.1(n).

                    Section 10.2.  Restrictions on Liens.  Each of the GPC
          Borrowers will not (a) create or incur or suffer to be created or
          incurred or to exist any Lien of any kind upon any of its
          property or assets of any character whether now owned or
          hereafter acquired, or upon the income or profits therefrom; (b)
          sell, assign, pledge or otherwise transfer any accounts, contract
          rights, general intangibles, chattel paper or instruments, with
          or without recourse; or (c) grant a negative pledge on any of its
          assets in favor of any Person other than the Bank; provided, that
          any GPC Borrower may create or incur or suffer to be created or
          incurred or to exist:

                              (i)  Liens in favor of any GPC Borrower on
          all or part of the assets of the Foreign Subsidiaries securing
          Indebtedness owing by such Subsidiaries to such Borrower;

                             (ii)  Liens to secure taxes, assessments and
          other government charges or liens on properties to secure claims
          for labor, material or supplies in respect of obligations permitted
          under Section 9.8;

                            (iii)  deposits or pledges made in connection
          with, or to secure payment of, workmen's compensation, unemployment
          insurance, old age pensions or other social security obligations
          or similar obligations;

                             (iv)  Liens on properties in respect of
          judgments or awards which do not constitute an Event of Default
          under Section 14.1(j);

                              (v)  Liens of carriers, warehousemen,
          mechanics and materialmen, and other like liens on properties,
          in respect of obligations not overdue by more than 90 days
          or permitted under Section 9.8;

                             (vi)  encumbrances on Real Estate consisting
          of easements, rights of way, zoning restrictions, restrictions on
          the use of real property and defects and irregularities in the
          title thereto, landlord's or lessor's liens under leases to which
          such GPC Borrower is a party, and other minor Liens or
          encumbrances none of which in the opinion of the GPC Borrowers
          interferes materially with the use of the property affected in
          the ordinary conduct of the business of the GPC Borrowers, which
          defects do not individually or in the aggregate have a Materially
          Adverse Effect;

                            (vii)  Liens not otherwise permitted under this
          Section 10.2 existing on the date hereof and listed on Schedule 
          10.2 hereto;

                           (viii)  purchase money security interests in or
          purchase money mortgages on or the interest of a lessor in real or
          personal property to secure purchase money Indebtedness or
          Capitalized Leases of the type and amount permitted by Section
          10.1(g), incurred in connection with the acquisition of such
          property, which security interests or mortgages cover only the
          real or personal property so acquired;

                             (ix)  Liens in favor of the Bank under the
          Loan Documents;

                              (x)  good faith pledges or deposits made in
          the ordinary course of business to secure performance of bids,
          tenders, contracts (other than for the repayment of borrowed
          money) or leases or to secure statutory obligations, or surety,
          appeal, indemnity, performance or similar bonds required in the
          ordinary course of business;

                             (xi)  any interest or title of a lessor in
          assets being leased by any of the GPC Borrowers under an
          operating lease; and

                    (xii)  Liens to secure a letter of credit in the amount
          of $23,762.83 issued by Nationsbank, National Association for the
          benefit of B.F. Saul Real Estate Investment Trust.

                    Section 10.3.  Restrictions on Investments.  Each of
          the GPC Borrowers will not make or permit to exist or to remain
          outstanding any Investment except Investments in:

                    (a)  marketable direct or guaranteed obligations of the
          United States of America that mature within one (1) year from the
          date of purchase by such Borrower;

                    (b)  demand deposits, certificates of deposit, bankers
          acceptances and time deposits of United States banks having total
          assets in excess of $1,000,000,000;

                    (c)  securities commonly known as "commercial paper"
          issued by a corporation organized and existing under the laws of
          the United States of America or any state thereof that at the
          time of purchase have been rated and the ratings for which are
          not less than "P 1" if rated by Moody's Investors Services, Inc.,
          and not less than "A 1" if rated by Standard and Poor's;

                    (d)  Investments existing on the date hereof and listed
          on Schedule 8.17, Schedule 8.18, Schedule 10.3(d) or Schedule
          10.1(i) hereto;

                    (e)  Investments with respect to Indebtedness permitted
          by Section 10.1(f) or 10.1(j);

                    (f)  Investments consisting of loans and advances to
          employees for moving, entertainment, travel and other similar
          expenses in the ordinary course of business not to exceed
          $100,000 in the aggregate at any time outstanding;

                    (g)  other Investments (other than with the Foreign
          Subsidiaries, the Joint Venture or the joint venture referred to
          in paragraph 2 of Section 10.3(h)) in an aggregate amount not to
          exceed $500,000 at any time outstanding;

                    (h)  Investments described on Schedule 10.3(h); and

                    (i)  Investments consisting of the loans evidenced or
          to be evidenced by the NPDC Subordinated Pledged Note.

                    Section 10.4.  Distributions.  GPC will not make any
          Distributions, except GPC may (a) consistent with the fiduciary
          duties of the GPC Board of Directors, GPC's normal course of
          business and Applicable Law, declare and pay dividends in respect
          of its common stock and (b) repurchase GPC common stock with an
          aggregate value not to exceed $3,000,000, provided, that for
          purposes of this Section 10.4, the repurchased GPC common stock
          shall be valued at the closing price of such common stock on the
          national securities exchange upon which such common stock is
          listed on the Business Day immediately preceding the date of
          repurchase, and if such common stock is not so listed or there is
          no closing price, at such other price as the Bank shall
          reasonably determine.  

                    Section 10.5.  Merger Consolidation and Disposition of
          Assets.  

                         10.5.1.  Mergers and Acquisitions.  Each of the
          GPC Borrowers will not become a party to any merger or
          consolidation, or liquidate or dissolve itself (or suffer any
          liquidation or dissolution) or agree to or effect any asset
          acquisition or stock acquisition or acquire any interest in any
          partnership, joint venture or similar enterprise (other than the
          acquisition of assets in the ordinary course of business
          consistent with past practices) except (i) in connection with
          Investments permitted pursuant to Section 10.3 and (ii) a merger
          or consolidation among any of the GPC Borrowers, provided, that
          if GPC is a party thereto, GPC is the surviving entity.

                         10.5.2.  Disposition of Assets.  Each of the GPC
          Borrowers will not become a party to or agree to or effect any
          disposition of assets, other than (a) the disposition of assets
          in the ordinary course of business, consistent with past
          practices, (b) the transfer of assets in connection with a merger
          or consolidation permitted by Section 10.5.1 and (c) dispositions
          of assets permitted under the proviso in Section 9.6.

                    Section 10.6.  Sale and Leaseback.  Except in
          connection with the making by the GPC Borrowers of Capital
          Expenditures permitted by and charged against the amounts
          permitted under Section 10.15 hereof, each of the GPC Borrowers
          will not enter into any arrangement, directly or indirectly,
          whereby such Borrower shall sell or transfer any property owned
          by it in order then or thereafter to lease such property or lease
          other property that such Borrower intends to use for
          substantially the same purpose as the property being sold or
          transferred.

                    Section 10.7.  Compliance with Environmental Laws. 
          Each of the GPC Borrowers will not (a) use any of the Real Estate
          or any portion thereof for the handling, processing, storage or
          disposal of Hazardous Substances except for the handling of
          samples of Hazardous Materials, in accordance with Environmental
          Laws, for purposes of analysis, (b) cause or permit to be located
          on any of the Real Estate any underground tank or other
          underground storage receptacle for Hazardous Substances, (c)
          generate any Hazardous Substances on any of the Real Estate, (d)
          conduct any activity at any Real Estate or use any Real Estate in
          any manner so as to cause a release (i.e. releasing, spilling,
          leaking, pumping, pouring, emitting, emptying, discharging,
          injecting, escaping, leaching, disposing or dumping) or
          threatened release of Hazardous Substances on, upon or into the
          Real Estate or (e) otherwise conduct any activity at any Real
          Estate or use any Real Estate in any manner that would violate
          any Environmental Law or bring such Real Estate in violation of
          any Environmental Law.

                    Section 10.8.  Prohibited Changes and Payments.  Each
          of the GPC Borrowers will not (a) amend, supplement or otherwise
          modify the terms of any of the Subordinated Debt or (b) prepay,
          redeem, purchase, defease, exchange or repurchase any of such
          Subordinated Debt.

                    Section 10.9.  Employee Benefit Plans.  Neither the
          GPC Borrowers nor any ERISA Affiliate will:

                    (a)  engage in any "prohibited transaction" within the
          meaning of Section 406 of ERISA or Section 4975 of the Code that
          could result in a material liability for any Borrower; or

                    (b)  permit any Guaranteed Pension Plan to incur an
          "accumulated funding deficiency", as such term is defined in
          Section 302 of ERISA, whether or not such deficiency is or may be
          waived; or

                    (c)  fail to contribute to any Guaranteed Pension Plan
          to an extent that, or terminate any Guaranteed Pension Plan in a
          manner that, could result in the imposition of a lien or
          encumbrance on the assets of any Borrower pursuant to Section
          302(f) or Section 4068 of ERISA; or

                    (d)  permit or take any action that would result in the
          aggregate benefit liabilities (with the meaning of Section 4001
          of ERISA) of all Guaranteed Pension Plans exceeding the value of
          the aggregate assets of such Plans, disregarding for this purpose
          the benefit liabilities and assets of any such Plan with assets
          in excess of benefit liabilities.

                    Section 10.10.  Certain Transactions.  (a) Except for
          transactions otherwise permitted by this Agreement (and subject
          to the terms and conditions of this Agreement), none of the GPC
          Borrowers will enter into or be a party to any transaction with
          any Affiliate (other than any other GPC Borrower), any NPDC
          non-public stockholder or with any officer, director, or employee
          of
          any of the Borrowers, including any contract, agreement or other
          arrangement providing for the furnishing of services to or by,
          providing for rental of real or personal property to or from, or
          otherwise requiring payments to or from any NPDC non-public
          stockholder, any officer, director or employee or, to the
          knowledge of the GPC Borrowers, any corporation, partnership,
          trust or other entity in which any NPDC non-public stockholder,
          officer, director, or employee has a substantial interest or is
          an officer, director, trustee or partner, except (i) arms length
          transactions pursuant to which any GPC Borrower makes or receives
          payments or other consideration in the ordinary course of
          business upon terms no less favorable than such GPC Borrower
          could obtain from third parties, (ii) license and royalty
          agreements and equipment leases with certain Affiliates of GPC
          listed on Schedule 10.10 hereto, (iii) reasonable compensation
          for services of officers, directors or employees (including the
          issuance of stock options to officers, employees and directors)
          and (iv) management fees paid to NPDC in the amount of no more
          than $250,000 per year.

                    Section 10.11.  Limitation on Certain Changes.  Each of
          the GPC Borrowers shall not at any time (a) in the case of such
          Borrower, engage primarily (directly or indirectly) in any
          business except the business conducted by such Borrower on the
          Closing Date and any business related thereto, (b) change its
          organizational structure from that of a corporation to another
          organizational structure, (c) amend its charter or by-laws,
          except for amendments (of which prior written notice has been
          given to the Bank) that would not adversely affect any
          Obligations, any Collateral, any rights of the Bank under the
          Loan Documents or the ability of such Borrower to perform its
          NPDC Obligations or GPC Obligations, as the case may be, or
          conduct its business as previously conducted or (d) except as may
          be required by generally accepted accounting principles, change
          the accounting treatment or reporting practices of NPDC and its
          Subsidiaries or GPC and its Subsidiaries from those in effect as
          of the Balance Sheet Date; provided, that nothing in this Section
          10.11 shall prevent any of the GPC Borrowers from discontinuing
          the operation and maintenance of any of its properties and
          disposing of same if such discontinuance, or discontinuance and
          disposition, is, in the judgment of such GPC Borrower, desirable
          in the conduct of its business and all such discontinuances, or
          discontinuances and dispositions, do not in the aggregate have a
          Materially Adverse Effect.

                    Section 10.12.  Fiscal Year.  Each of the GPC Borrowers
          shall not cause or permit its fiscal year to end on any date
          other than December 31 of each year unless it gives not less than
          thirty (30) days' prior written notice thereof to the Bank and
          the GPC Borrowers agree to changes in this Credit Agreement that
          the Bank deems to be necessary or appropriate in connection with
          such change.

                    Section 10.13.  Ownership of Subsidiaries.  GPC shall
          not own, directly or indirectly, less than one hundred percent
          (100%) of the voting capital stock of each of its Subsidiaries.

                    Section 10.14.  GPC Fixed Charge Coverage.  Commencing
          with the fiscal quarter ended September 30, 1995, the GPC
          Borrowers will not permit the ratio of (a) Consolidated EBITDA of
          GPC and its Subsidiaries to (b) Consolidated Fixed Charges of GPC
          and its Subsidiaries to be less than 2.0:1.0 on a Rolling Four
          Quarter basis, as of the end of each fiscal quarter.

                    Section 10.15.  Capital Expenditures.  The GPC
          Borrowers will not make Capital Expenditures in any fiscal year
          that exceed, in the aggregate, $500,000 for such fiscal year. 

                    Section 10.16.  GPC Consolidated Tangible Net Worth. 
          The GPC Borrowers will not at any time permit Consolidated
          Tangible Net Worth of GPC and its Subsidiaries to be less than
          $19,000,000.

                    Section 10.17.  GPC Consolidated Senior Debt to
          Consolidated Tangible Net Worth.  The GPC Borrowers will not at
          any time permit the ratio of (a) Consolidated Senior Debt of GPC
          and its Subsidiaries to (b) Consolidated Tangible Net Worth of
          GPC and its Subsidiaries to exceed 1.5:1.0.

                    Section 10.18.  No GPC Loss.  The GPC Borrowers will
          not permit the Consolidated Net Income of GPC and its
          Subsidiaries for any fiscal quarter to be less than $0.


                                      ARTICLE XI

                          CERTAIN NEGATIVE COVENANTS OF NPDC

                    NPDC covenants and agrees (on behalf of and with
          respect to itself and for so long as the Term Loan or the Term
          Note is outstanding) as follows:

                    Section 11.1.  Restrictions on Liens.  NPDC will not
          create or incur or suffer to be created or incurred or to exist
          any Lien of any kind upon any of the properties or assets of
          NPDC, whether now owned or hereafter acquired, which are covered
          by any of the Security Documents, except for the Liens created by
          such Security Documents and Liens of the nature permitted by
          Sections 10.2(ii) and 10.2(iv) which attach to the general assets
          of NPDC.

                    Section 11.2.  Restrictions on Guaranties.  (a)  Except
          as set forth on Schedule 11.2 hereto and as permitted by Section
          11.2(b) below, NPDC will not assume, endorse, or be or become
          liable for, or guarantee the obligations of any Person, except by
          the endorsement of negotiable instruments for deposit or
          collection in the ordinary course of business.  For the purposes
          of this Section 11.2, the term "guarantee" shall include any
          agreement, whether such agreement is on a contingency or
          otherwise, to purchase, repurchase or otherwise acquire
          Indebtedness of any other Person, or to purchase, sell or lease
          as lessee or lessor, property or services, in any such case
          primarily for the purpose of enabling another Person to make
          payment of Indebtedness, or to make any payment (whether as an
          advance, capital contribution, purchase of an equity interest or
          otherwise) to assure a minimum equity, asset base, working
          capital or other balance sheet or financial condition, in
          connection with the Indebtedness of another Person, or to supply
          funds to or in any manner invest in another Person in connection
          with such Person's Indebtedness.

                    (b)  In addition to the foregoing, NPDC shall be
          permitted to guarantee the obligations of other Persons on the
          following terms and conditions:

                              (i)  at the time of, and immediately after,
          entering into any such guarantee, no Default or Event of Default 
          shall have occurred and be continuing;

                             (ii)  the aggregate amount of all guarantees
          entered into pursuant to this Section 11.2(b) (whether guarantees
          of payment or performance) shall at no time exceed the excess of
          (A) NPDC's aggregate available, unencumbered and unrestricted
          cash, cash equivalents and marketable securities (as defined in
          accordance with generally accepted accounting principles) over
          (B) $5,000,000;

                            (iii)  the aggregate amount of all guarantees
          entered into pursuant to this Section 11.2(b) (whether guarantees
          of payment or performance) shall at no time exceed $5,000,000;

                             (iv)  the aggregate amount of all guarantees
          of payment obligations entered into pursuant to this Section 11.2(b)
          shall at no time exceed $3,000,000; and

                              (v)  for the purposes hereof, the "amount" of
          a guarantee shall mean, as to guarantees of payment, the aggregate
          maximum amount as to which the guarantor may be liable at any
          time in respect of such guarantee, and as to guarantees of
          performance, the aggregate maximum amount of the consideration
          payable at any time for such performance to the Person whose
          performance is being guaranteed.

                    Section 11.3.  Mergers and Acquisitions.  NPDC will not
          become a party to any merger or consolidation, or acquire all or
          substantially all of the assets or any of the capital stock of
          any Person, or liquidate or dissolve itself (or suffer any
          liquidation or dissolution); provided, that NPDC may merge with
          another Person or acquire all or substantially all of the assets
          or capital stock of another Person, if, and only if, all of the
          following conditions are satisfied:

                    (a)  NPDC shall have given the Bank not less than
          thirty days' prior written notice of such merger or acquisition
          together with a reasonably detailed description of the terms
          thereof;

                    (b)  if such proposed transaction is a merger, NPDC
          shall be the survivor thereof;

                    (c)  the aggregate amount of consideration paid by NPDC
          in respect of any such merger or acquisition shall not exceed ten
          percent (10%) of NPDC's Consolidated Tangible Net Worth
          immediately prior to the consummation of such merger or
          acquisition; and

                    (d)  no Default or Event of Default shall exist
          hereunder immediately prior to or immediately after the
          consummation of any such merger or acquisition.

                    Section 11.4.  Certain Transactions.  Except for
          transactions otherwise permitted by this Agreement (and subject
          to the terms and conditions of this Agreement), NPDC will not
          enter into or be a party to any transaction with any Affiliate or
          with any NPDC non-public stockholder, or with any officer,
          director, or employee of any of the Borrowers, including any
          contract, agreement or other arrangement providing for the
          furnishing of services to or by, providing for rental of real or
          personal property to or from, or otherwise requiring payments to
          or from any NPDC non-public stockholder, officer, director or
          employee or, to the knowledge of NPDC, any corporation,
          partnership, trust or other entity in which any NPDC non-public
          stockholder, officer, director, or employee has a substantial
          interest or is an officer, director, trustee or partner, except
          (i) arms length transactions pursuant to which NPDC makes or
          receives payments in the ordinary course of business upon terms
          no less favorable than NPDC could obtain from third parties, (ii)
          license and royalty agreements and equipment leases with certain
          Affiliates of GPC listed on Schedule 10.10 hereto, (iii)
          reasonable compensation for services of officers, directors or
          employees (including the issuance of stock options to officers,
          employees and directors) and (iv) management fees paid to NPDC in
          the amount of no more than $250,000 per year.

                    Section 11.5.  Fiscal Year.  NPDC shall not cause or
          permit its fiscal year to end on any date other than December 31
          of each year unless it gives not less than thirty (30) days'
          prior written notice thereof to the Bank and NPDC agrees to
          changes in this Credit Agreement that the Bank deems to be
          necessary or appropriate in connection with such change.

                    Section 11.6.  Ownership of Subsidiaries.  NPDC shall
          not own, directly or indirectly, less than forty-five percent
          (45%) of the voting capital stock of GPC.

                    Section 11.7.  Available Cash.  NPDC shall not permit,
          as to NPDC only, on an unconsolidated basis, as of the end of
          each fiscal quarter, available, unencumbered and unrestricted
          cash, cash equivalents and marketable securities (as such terms
          are defined in accordance with generally accepted accounting
          principles) to be less than $5,000,000 in the aggregate, of which
          amount, not more than $2,500,000 shall consist of marketable
          securities.

                    Section 11.8.  NPDC Collateral to Loan Ratio.  NPDC
          will not permit the ratio of (a) the value of the NPDC Collateral
          to (b) the principal amount of the Term Loan to be less than
          2.5:1.0 for five consecutive days.  NPDC may at any time pledge
          additional assets as NPDC Collateral or prepay the Term Loan to
          maintain compliance with this Section 11.8.  For purposes of
          determining the value of NPDC Collateral at any date of
          determination, (i) the common stock of GPC and GTS Duratek, Inc.,
          pledged by NPDC under the Pledge Agreement, shall be valued at
          the closing price of such common stock on the national securities
          exchange upon which such common stock is listed on the Business
          Day immediately preceding such date of determination and if such
          stock is not so listed or there is no closing price, at such
          other price as the Bank shall reasonably determine and (ii) the
          Pledged Debentures, so long as there is no default thereunder
          shall be valued at the then outstanding principal amount thereof
          and if such a default exists they shall have such value as the
          Bank shall deem appropriate in its reasonable discretion.

                    Section 11.9.  NPDC Collateral Cash Flow Coverage. 
          NPDC will not permit the ratio of (a) NPDC Collateral Cash Flow
          to (b) interest and principal payments on the Term Loan to be
          less than 1.0:1.0 on a Rolling Four Quarters Basis, as of the end
          of any fiscal quarter.

                    Section 11.10.  NPDC Leverage Ratio.  NPDC will not at
          any time permit the ratio of (a) Consolidated Tangible Net Worth
          of NPDC and its Subsidiaries to (b) Consolidated Total
          Liabilities of NPDC and its Subsidiaries to be less than 4.0:1.0.


                                     ARTICLE XII

                                  CLOSING CONDITIONS

                    The obligations of the Bank to make the Term Loan and
          the initial Revolving Credit Loans and to issue any initial
          Letters of Credit shall be subject to the satisfaction of the
          following conditions precedent on or prior to April 10, 1995:

                    Section 12.1.  Loan Documents.  

                         12.1.1.  Loan Documents.  Each of the Loan
          Documents shall have been duly executed and delivered by the
          respective parties thereto, shall be in full force and effect and
          shall be in form and substance reasonably satisfactory to the
          Bank.  The Bank shall have received a fully executed original of
          each such document.

                         12.1.2.  Subordination Documents.  Each of the
          Subordination Documents shall have been duly executed and
          delivered by the respective parties thereto, shall be in full
          force and effect and shall be in form and substance reasonably
          satisfactory to the Bank.  The Bank shall have received a true
          and correct copy of each such document as well as a certificate
          of an officer of GPC stating that there exists no default by GPC
          thereunder.

                    Section 12.2.  Certified Copies of Charter Documents;
          Good Standing Certificates.  The Bank shall have received from
          each of the Borrowers a copy, certified by a duly authorized
          officer of such Person to be true and complete on the Closing
          Date, of each of (a) its charter or other incorporation or
          organizational documents as in effect on the Closing Date, and
          (b) its by-laws or other applicable governing documents, if any,
          as in effect on the Closing Date.  Each of such documents shall
          be in full force and effect and in form and substance reasonably
          satisfactory to the Bank.  In addition, the Bank shall have
          received with respect to each of the Borrowers certificates of
          good standing and of foreign qualification dated as of recent
          date issued by the secretary of state (or comparable authority)
          in each state where the nature of such Borrower's business makes
          such authority necessary except where the failure to be in good
          standing or so qualified, singly or in the aggregate, would not
          have a Materially Adverse Effect.

                    Section 12.3.  Corporate Action.  All corporate action
          necessary for the valid execution, delivery and performance by
          each of the Borrowers of this Credit Agreement and the other Loan
          Documents to which it is or is to become a party shall have been
          duly and effectively taken, and evidence thereof satisfactory to
          the Bank shall have been provided to the Bank.

                    Section 12.4.  Incumbency Certificate.  The Bank shall
          have received from each of the Borrowers an incumbency
          certificate, dated as of the Closing Date, signed by a duly
          authorized officer of such Borrower, and giving the name and
          bearing a specimen signature of each individual who shall be
          authorized: (a) to sign, in the name and on behalf of such
          Borrower, each of the Loan Documents and Subordination Documents
          (other than the Indenture and the Pledged Debentures) to which
          such Borrower is or is to become a party; (b) in the case of GPC,
          to make Loan Requests and Conversion Requests on behalf of the
          GPC Borrowers and to apply for Letters of Credit on behalf of the
          GPC Borrowers; (c) in the case of NPDC, to make the Term Loan
          Request and (d) to give notices and to take other action on its
          behalf under the Loan Documents.

                    Section 12.5.  Validity of Liens.  The Security
          Documents shall each have been duly executed and delivered by the
          respective parties thereto and shall be in full force and effect
          and shall be effective to create in favor of the Bank a legal,
          valid and enforceable first (except for Permitted Liens entitled
          to priority under Applicable Law) security interest in and lien
          upon the Collateral.  All UCC and other filings, assignments,
          recordings, deliveries of instruments and other actions
          (including delivery to the Bank of executed forms required under
          the Federal Assignment of Claims Act of 1940 with respect to
          Government Receivables, to the extent provided in the Security
          Agreements) necessary or desirable in the opinion of the Bank to
          protect and preserve such security interests shall have been duly
          effected (other than the filing of the UCC-1 financing statements
          listed on Schedule 8.2 and other than the filing by Nationsbank,
          National Association of the UCC-3 termination statements listed
          on Schedule 8.2) and all filing and recording fees and taxes
          shall have been duly paid by the GPC Borrowers.  The Bank shall
          have received evidence thereof in form and substance satisfactory
          to the Bank.  The Bank agrees to cause to be filed at the GPC
          Borrower's expense all UCC-1 financing statements signed by the
          GPC Borrowers and delivered to the Bank on or prior to the
          Closing Date.

                    Section 12.6.  Lien Search Results.  The Bank shall
          have received from each of the GPC Borrowers the results of UCC,
          tax lien, judgment and suit searches, indicating no liens other
          than Permitted Liens and otherwise in form and substance
          satisfactory to the Bank, in the following locations: (a) for
          each of the GPC Borrowers, Maryland State Department of
          Assessments and Taxation and Howard County, Maryland and (b) in
          the case of GPESI, Montgomery County, Maryland.  If the results
          of the UCC searches indicate UCC filings in such jurisdictions,
          the Bank shall have received evidence of the filing with the
          appropriate filing offices of UCC-3 termination statements with
          respect to such UCC filings (other than those in respect of
          Permitted Liens and those with respect to Nationsbank, National
          Association listed on Schedule 8.2).

                    Section 12.7.  Evidence of Security Interests.  The
          Bank shall have received (a) the certificates representing the
          Collateral consisting of shares of common stock of GPC and GTS
          Duratek and the Pledged Debentures together with appropriate
          stock powers and bond powers and (b) the NPDC Subordinated
          Pledged Note pledged pursuant to the GPC Note Pledge Agreement. 
          The Bank shall also have received evidence reasonably
          satisfactory to it that the dividends on the GPC common stock
          pledged under the Pledge Agreement and the interest and principal
          payments on the Pledged Debentures will be paid directly to the
          cash collateral account of the Bank described in the Pledge
          Agreement.

                    Section 12.8.  Borrowing Base Report.  The Bank shall
          have received from GPC the initial Borrowing Base Report dated as
          of a date not earlier than 45 days prior to the Closing Date.

                    Section 12.9.  Opinions of Counsel.  The Bank shall
          have received (a) favorable legal opinions addressed to the Bank,
          dated as of the Closing Date, in form and substance satisfactory
          to the Bank, from (i) Piper & Marbury, counsel to the GPC
          Borrowers, (ii) Kenneth L. Crawford, General Counsel of the GPC
          Borrowers, (iii) Lawrence M. Gordon, Vice President and General
          Counsel of NPDC and (iv) Sullivan & Worcester, counsel to NPDC.

                    Section 12.10.  Payment of Fees and Expenses.  NPDC
          shall have paid to the Bank the closing fee pursuant to Section
          5.5.1 and the Borrowers shall have paid all other reasonable
          accrued fees and expenses, including, without limitation, the
          reasonable fees and expenses of the Bank's auditors and the Bank
          in connection with its due diligence and all filing fees and
          expenses not previously paid by the Borrowers shall have been
          paid to the Bank pursuant to Section 15.1.

                    Section 12.11.  Payoff Letter.  The Bank shall have
          received a payoff letter or other agreement in form and substance
          satisfactory to the Bank.

                    Section 12.12.  Disbursement Instructions.  The Bank
          shall have received disbursement instructions from the GPC
          Borrowers, indicating that a portion of the proceeds of the
          initial Revolving Credit Loans, in an amount equal to the
          aggregate loan obligations of the Borrowers to Nationsbank,
          National Association, are to be paid to such lender and such loan
          facility shall be terminated.

                    Section 12.13.  No Material Changes, Etc.  From the
          Balance Sheet Date to the Closing Date there has occurred no
          materially adverse change in the condition (financial or
          otherwise), business, operations, performance, or properties of
          the Borrowers taken as a whole as shown on or reflected in the
          consolidated balance sheet of NPDC and its Subsidiaries and GPC
          and its Subsidiaries, respectively, as at the Balance Sheet Date,
          or the consolidated statements of income for the fiscal year then
          ended, other than changes in the ordinary course of business that
          have not had a Materially Adverse Effect.  Since the Balance
          Sheet Date, GPC has not made any Distributions other than the
          payment of quarterly dividends in respect of its capital stock in
          an aggregate amount equal to approximately $1,206,500.

                    Section 12.14.  Representations True; No Default.  Both
          immediately prior to, and after giving effect to, the making of
          the Term Loan and the initial Revolving Credit Loans hereunder,
          each of the representations and warranties of each of the
          Borrowers contained in this Credit Agreement, the other Loan
          Documents or in any document or instrument delivered pursuant to
          or in connection with this Credit Agreement shall be true as of
          the date as of which they were made and shall also be true at and
          as of the Closing Date, with the same effect as if made at and as
          of that time and no Default or Event of Default shall have
          occurred and be continuing.  The Bank shall have received
          certificates of (a) NPDC and (b) the GPC Borrowers as to the
          representations made by them, respectively, signed by an
          authorized officer of each such Borrower to such effect.

                    Section 12.15.  Capital Structure.  The Bank shall be
          satisfied with the capital structure contemplated for each of the
          Borrowers.

                    Section 12.16.  Legal Restrictions.  No decree, order,
          judgment, statute, license, rule or regulation shall be
          applicable in the judgment of the Bank that restrains, prevents
          or imposes any materially adverse conditions upon any of the
          transactions contemplated by the Loan Documents.

                    Section 12.17.  Regulation U.  The Bank shall have
          received from NPDC a statement on FR Form U-1 duly completed in a
          manner acceptable to the Bank.

                    Section 12.18.  Due Diligence.  The Bank shall have
          completed an initial funding audit and a due diligence
          investigation of the Borrowers in scope, and with results,
          satisfactory to the Bank and shall have been given such access to
          the management, records, books of account, contracts and
          properties of the Borrowers and shall have received such
          financial, business and other information, certificates and other
          documents regarding the Borrowers as the Bank shall have
          requested, which shall all be in form and substance satisfactory
          to the Bank.

                    Section 12.19.  Satisfactory Documentation.  The Loan
          Documents shall be satisfactory to the Bank in its sole
          discretion. 


                                     ARTICLE XIII

                             CONDITIONS TO ALL BORROWINGS

                    The obligations of the Bank to make the Term Loan, any
          Revolving Credit Loan and to issue, extend or renew any Letter of
          Credit, in each case whether on or after the Closing Date, shall
          also be subject to the satisfaction of the following conditions
          precedent:

                    Section 13.1.  Representations True; No Event of
          Default.  With respect to the making of any Revolving Credit Loan
          or the issuance, extension or renewal of any Letter of Credit,
          each of the representations and warranties of the GPC Borrowers
          contained in this Credit Agreement, the other Loan Documents or
          in any document or instrument delivered pursuant to or in
          connection with this Credit Agreement shall be true as of the
          date as of which they were made and shall also be true at and as
          of the time of the making of such Revolving Credit Loan or the
          issuance, extension or renewal of such Letter of Credit, with the
          same effect as if made at and as of that time (except to the
          extent of changes resulting from transactions contemplated or
          permitted by this Credit Agreement and the other Loan Documents
          and changes occurring in the ordinary course of business that
          singly or in the aggregate do not have a Materially Adverse
          Effect on the GPC Borrowers, and except to the extent that such
          representations and warranties relate expressly to an earlier
          date) and no Default or Event of Default shall have occurred and
          be continuing.  The Bank shall have received the Loan Request of
          the GPC Borrowers signed by an authorized officer of each such
          Borrower to such effect.

                    Section 13.2.  No Legal Impediment.  No change shall
          have occurred in any law or regulations thereunder or
          interpretations thereof that in the reasonable opinion of the
          Bank would make it illegal for the Bank to make such Loan or to
          issue, extend or renew such Letter of Credit.

                    Section 13.3.  Governmental Regulation.  The Bank shall
          have received such statements in substance and form reasonably
          satisfactory to the Bank as the Bank shall require for the
          purpose of compliance with any Applicable Law or, without
          limiting the generality of the foregoing, any applicable
          regulations of the Comptroller of the Currency or the Board of
          Governors of the Federal Reserve System.

                    Section 13.4.  Proceedings and Documents.  All
          proceedings in connection with the transactions contemplated by
          this Credit Agreement, the other Loan Documents and all other
          documents incident thereto shall be satisfactory in substance and
          in form to the Bank and the Bank's Special Counsel, and the Bank
          and such counsel shall have received all information and such
          counterpart originals or certified or other copies of such
          documents as the Bank may reasonably request.

                    Section 13.5.  Borrowing Base Report.  The Bank shall
          have received the most recent Borrowing Base Report required to
          be delivered to the Bank in accordance with Section 9.4(f).

                    Section 13.6.  Sufficient Credit Availability.  After
          giving effect to the making of the requested Revolving Credit
          Loan or the issuance, extension or renewal of the Letter of
          Credit, the Available Credit is not less than $0.  The Bank shall
          have received a certificate of the GPC Borrowers signed by an
          authorized officer of each of the GPC Borrowers to such effect.


                                     ARTICLE XIV

                        EVENTS OF DEFAULT; ACCELERATION; ETC. 

                    Section 14.1.  Events of Default and Acceleration.  If
          any of the following events ("Events of Default" or, if the
          giving of notice or the lapse of time or both is required
          pursuant to this Section 14.1, then, prior to such notice or
          lapse of time, "Defaults") shall occur with respect to a Borrower
          (it being understood that a Default or Event of Default with
          respect to a GPC Borrower shall constitute a Default or Event of
          Default with respect to NPDC and all GPC Borrowers but that a
          Default or Event of Default with respect to NPDC, MXL or Five
          Star shall not constitute a Default or Event of Default with
          respect to any GPC Borrower):

                    (a)  (i) NPDC shall fail to pay any principal of the
          Term Loan, any interest on the Term Loan, the closing fee or
          other sums due and payable by NPDC hereunder or under any of the
          other Loan Documents or (ii) the GPC Borrowers shall fail to pay
          any principal of the Revolving Credit Loans, any Reimbursement
          Obligation, any interest on the Revolving Credit Loans, the
          commitment fee, any Letter of Credit Fee or other sums due  and
          payable by the GPC Borrowers hereunder or under any of the other
          Loan Documents, in each case, when the same shall become due and
          payable, whether at the stated date of maturity or any
          accelerated date of maturity or at any other date fixed for
          payment;

                    (b)  any of the Borrowers shall fail to comply with any
          of its covenants contained in Article X;

                    (c)  any of the Borrowers shall fail to comply with any
          of its covenants contained in Article IX (other than Section 9.5)
          and such failure shall continue unremedied for fifteen (15) days
          after written notice of such failure has been given to such
          Borrower by the Bank;

                    (d)  any of the Borrowers shall fail to perform any
          term, covenant or agreement contained herein or in any of the
          other Loan Documents (other than those specified elsewhere in
          this Section 14.1) for fifteen (15) days after written notice of
          such failure has been given to such Borrower by the Bank;

                    (e)  any representation or warranty of any of the
          Borrowers in this Credit Agreement or any of the other Loan
          Documents or in any other document or instrument delivered
          pursuant to this Credit Agreement shall prove to have been false
          in any material respect upon the date when made or deemed to have
          been made or repeated;

                    (f)  any of the GPC Borrowers or any of their
          Subsidiaries shall, after required notice, if any, fail to pay
          any obligation (direct or indirect) for borrowed money
          (including, without limitation, the Subordinated Debt) or in
          respect of any Capitalized Leases or guarantees of any of the
          foregoing, in each case beyond any period of grace with respect
          thereto, that, in any such case, is outstanding in a principal or
          notional amount of at least $250,000 in the aggregate, or shall,
          after required notice, if any, fail to observe or perform any
          material term, covenant or agreement contained in any agreement
          by which it is bound, beyond any period of grace with respect
          thereto, evidencing or securing such borrowed money or in respect
          of any such Capitalized Leases or guarantees of the foregoing for
          such period of time as would permit the holder or holders thereof
          or of any obligations issued thereunder to accelerate the
          maturity thereof;

                    (g)  any of NPDC (or MXL or Five Star, so long as any
          obligation is outstanding under any MXL Agreement or any Five
          Star Agreement, as the case may be) shall, after required notice,
          if any, fail to pay any obligation (direct or indirect) for
          borrowed money (including, without limitation, the Subordinated
          Debt) or in respect of any Capitalized Leases or guarantees of
          any of the foregoing, in each case beyond any period of grace
          with respect thereto, that, in any such case, is outstanding in a
          principal or notional amount of at least $500,000 in the
          aggregate, or shall, after required notice, if any, fail to
          observe or perform any material term, covenant or agreement
          contained in any agreement by which it is bound, beyond any
          period of grace with respect thereto, evidencing or securing such
          borrowed money or in respect of any such Capitalized Leases or
          guarantees of the foregoing for such period of time as would
          permit the holder or holders thereof or of any obligations issued
          thereunder to accelerate the maturity thereof;

                    (h)  any of NPDC, MXL or Five Star, any of the GPC
          Borrowers or any of the GPC Borrowers' Subsidiaries shall make an
          assignment for the benefit of creditors, or admit in writing its
          inability generally to pay or generally fail to pay its debts as
          they mature or become due, or shall petition or apply for the
          appointment of a trustee or other custodian, liquidator or
          receiver of any of NPDC, MXL or Five Star, the GPC Borrowers or
          any of the GPC Borrowers' Subsidiaries or of any substantial part
          of the assets of any of NPDC, MXL or Five Star, the GPC Borrowers
          or any of the GPC Borrowers' Subsidiaries or shall commence any
          case or other proceeding relating to any of NPDC, MXL or Five
          Star, the GPC Borrowers or any of the GPC Borrowers' Subsidiaries
          under any bankruptcy, reorganization, arrangement, insolvency,
          readjustment of debt, dissolution or liquidation or similar law
          of any jurisdiction, now or hereafter in effect, or shall take
          any action to authorize or in furtherance of any of the
          foregoing, or if any such petition or application shall be filed
          or any such case or other proceeding shall be commenced against
          any of NPDC, MXL or Five Star, the GPC Borrowers or any of the
          GPC Borrowers' Subsidiaries and any of NPDC, MXL or Five Star,
          the GPC Borrowers or any of the GPC Borrowers' Subsidiaries shall
          indicate its approval thereof, consent thereto or acquiescence
          therein or such case or other proceeding shall remain undismissed
          or unstayed for a period of sixty (60) days or more; provided,
          that with respect to MXL and Five Star, this paragraph shall only
          apply so long as any obligation is outstanding under any MXL
          Agreement or any Five Star Agreement, as the case may be;

                    (i)  a decree or order is entered appointing any such
          trustee, custodian, liquidator or receiver or adjudicating any of
          NPDC, MXL or Five Star, the GPC Borrowers or any of the GPC
          Borrowers' Subsidiaries bankrupt or insolvent, or approving a
          petition in any such case or other proceeding, or a decree or
          order for relief is entered in respect of any of NPDC, MXL or
          Five Star, the GPC Borrowers or any of the GPC Borrowers'
          Subsidiaries in an involuntary case under federal bankruptcy laws
          as now or hereafter constituted; provided, that with respect to
          MXL and Five Star, this paragraph shall only apply so long as any
          obligation is outstanding under any MXL Agreement or any Five
          Star Agreement, as the case may be;

                    (j)  there shall remain in force, undischarged,
          unsatisfied and unstayed, for more than thirty days, whether or
          not consecutive, any final judgment against any of NPDC, the GPC
          Borrowers or any of the GPC Borrowers' Subsidiaries that, with
          other outstanding final judgments, undischarged, unsatisfied and
          unstayed against any of NPDC, the GPC Borrowers or any of the GPC
          Borrowers' Subsidiaries to the extent not covered by insurance
          exceeds in the aggregate $300,000;

                    (k)  any of the Loan Documents shall be canceled,
          terminated, revoked or rescinded otherwise than in accordance
          with the terms thereof or with the express prior written
          agreement, consent or approval of the Bank, or any action at law,
          suit or in equity or other legal proceeding to cancel, revoke or
          rescind any of the Loan Documents shall be commenced by or on
          behalf of any of the Borrowers party thereto or any of their
          respective stockholders, or any court or any other governmental
          or regulatory authority or agency of competent jurisdiction shall
          make a determination that, or issue a judgment, order, decree or
          ruling to the effect that, any one or more of the Loan Documents
          is illegal, invalid or unenforceable in accordance with the terms
          thereof;

                    (l)  with respect to any Guaranteed Pension Plan, an
          ERISA Reportable Event shall have occurred and the Bank shall
          have determined in its reasonable discretion that such event
          reasonably could be expected to result in liability of any of the
          Borrowers to the PBGC or such Guaranteed Pension Plan in an
          aggregate amount exceeding $100,000 and such event in the
          circumstances occurring reasonably could constitute grounds for
          the termination of such Guaranteed Pension Plan by the PBGC or
          for the appointment by the appropriate United States District
          Court of a trustee to administer such Guaranteed Pension Plan; or
          a trustee shall have been appointed by the United States District
          Court to administer such Guaranteed Pension Plan; or the PBGC
          shall have instituted proceedings to terminate such Guaranteed
          Pension Plan;

                    (m)  any of the Borrowers shall be enjoined, restrained
          or in any way prevented by the order of any court or any
          administrative or regulatory agency from conducting any material
          part of its business and such order shall continue in effect for
          more than thirty (30) days;

                    (n)  (i) Any of the Security Documents shall cease, for
          any reason, to be in full force and effect, or any Borrower or
          any other Person which is a party to any of the Security
          Documents shall so assert or (ii) the Lien created by any of the
          Security Documents shall cease to be enforceable and of the same
          effect and priority purported to be created thereby, except with
          respect to Liens permitted by or of the nature permitted by
          Section 10.2(ii) or 10.2(iv) hereof with respect to any Borrower;
          or

                    (o)  (i) Any Person or "group" (within the meaning of
          Section 13(d) or 14(d) of the Securities Exchange Act of 1934, as
          amended) (i) shall obtain the power (whether or not exercised) to
          elect a majority of GPC's directors except NPDC or (ii) the Board
          of Directors of GPC shall not consist of a majority of Continuing
          Directors; "Continuing Directors" shall mean the directors of GPC
          on the Closing Date and each other director, if such other
          director's nomination for election to the Board of Directors of
          GPC is recommended by a majority of the then Continuing
          Directors;

          then, in the case of any such Event of Default (i) with respect
          to a GPC Borrower, so long as the same may be continuing, the
          Bank may, by notice in writing to the Borrowers declare all
          amounts owing with respect to this Credit Agreement, the Term
          Note, the Revolving Credit Note and the other Loan Documents and
          all Reimbursement Obligations to be, and they shall thereupon
          forthwith become, immediately due and payable without
          presentment, demand, protest or other notice of any kind, all of
          which are hereby expressly waived by each of the Borrowers; and
          (ii) with respect to NPDC, so long as the same may be continuing,
          the Bank may, by notice in writing to NPDC declare all amounts
          owing by NPDC under this Credit Agreement, the Term Note and the
          other Loan Documents to be, and they shall thereupon forthwith
          become, immediately due and payable without presentment, demand,
          protest or other notice of any kind, all of which are hereby
          expressly waived by NPDC; provided, that in the event of any
          Event of Default specified in Section 14.1(h) or Section 14.1(i),
          all such amounts referred to in clause (i) or (ii), as
          applicable, shall become immediately due and payable
          automatically and without any requirement of notice from the
          Bank.

                    Section 14.2.  Termination of Commitment.  If any one
          or more of the Events of Default specified in Section 14.1(h) or
          Section 14.1(i) shall occur with respect to a GPC Borrower, any
          unused portion of the Revolving Credit Commitment hereunder shall
          forthwith terminate and the Bank shall be relieved of all further
          obligations to make Revolving Credit Loans to the GPC Borrowers
          and to issue, extend or renew Letters of Credit.  If any other
          Event of Default with respect to a GPC Borrower, shall have
          occurred and be continuing, the Bank may terminate the unused
          portion of the Revolving Credit Commitment hereunder, and upon
          such notice being given such unused portion of the credit
          hereunder shall terminate immediately and the Bank shall be
          relieved of all further obligations to make Revolving Credit
          Loans and all further obligations to issue, extend or renew
          Letters of Credit.  No termination of the Revolving Credit
          Commitment hereunder shall relieve any of the GPC Borrowers of
          any of the GPC Obligations or any of its existing obligations to
          the Bank arising under other agreements or instruments.

                    Section 14.3.  Remedies.  In case any one or more of
          the Events of Default shall have occurred and be continuing, and
          whether or not the Bank shall have accelerated the maturity of
          the Loans pursuant to Section 14.1, the Bank, if owed any amount
          with respect to the Loans or the Reimbursement Obligations, may
          proceed to protect and enforce its rights against NPDC and/or the
          GPC Borrowers, as applicable, by suit in equity, action at law or
          other appropriate proceeding, whether for the specific
          performance of any covenant or agreement contained in this Credit
          Agreement and the other Loan Documents or any instrument pursuant
          to which the NPDC Obligations or the GPC Obligations to the Bank
          are evidenced, and, if such amount shall have become due, by
          declaration or otherwise, proceed to enforce the payment thereof
          or any other legal or equitable right of the Bank.  No remedy
          herein conferred upon the Bank is intended to be exclusive of any
          other remedy and each and every remedy shall be cumulative and
          shall be in addition to every other remedy given hereunder or now
          or hereafter existing at law or in equity or by statute or any
          other provision of law.

                    Section 14.4.  Setoff.  Regardless of the adequacy of
          any Collateral, during the continuance of any Event of Default,
          any deposits or other sums credited by or due from the Bank to
          any of the Borrowers and any securities or other property of any
          of the Borrowers in the possession of the Bank may be applied to
          or set off by the Bank against (i) if such Event of Default is
          with respect to any Borrower and such Borrower is NPDC, the
          payment of the NPDC Obligations (and any and all other
          liabilities, direct, or indirect, absolute or contingent, due or
          to be become due, now existing or hereafter arising, of NPDC to
          the Bank) or (ii) if such Event of Default is with respect to the
          GPC Borrowers and such Borrower is a GPC Borrower, to the payment
          of GPC Obligations (and any and all other liabilities, direct, or
          indirect, absolute or contingent, due or to become due, now
          existing or hereafter arising, of any of the GPC Borrowers to the
          Bank).

                    Section 14.5.  Waiver.  No waiver of notice in the Term
          Note or the Revolving Credit Note shall affect the requirement of
          notice under this Article XIV.


                                      ARTICLE XV

                          PROVISIONS OF GENERAL APPLICATION

                    Section 15.1.  Expenses.  The Borrowers, jointly and
          severally, agree to pay (except to the extent such amounts can be
          allocated to NPDC or the GPC Borrowers, respectively, in which
          case NPDC severally agrees to pay and the GPC Borrowers jointly
          and severally agree to pay, as the case may be) (a) the
          reasonable costs of producing and reproducing this Credit
          Agreement, the other Loan Documents and the other agreements and
          instruments mentioned herein, or any amendments, modifications or
          supplements thereto, (b) any taxes (including any interest and
          penalties in respect thereto) payable by the Bank (other than net
          income taxes and franchise taxes imposed in lieu of net income
          taxes) on or with respect to the transactions contemplated by
          this Credit Agreement (the Borrowers, jointly and severally,
          hereby agreeing to indemnify the Bank with respect thereto), (c)
          the reasonable fees, expenses and disbursements of the Bank's
          Special Counsel or any local counsel to the Bank incurred in
          connection with the preparation, administration or interpretation
          of the Loan Documents and other instruments mentioned herein,
          each closing hereunder, and amendments, modifications, approvals,
          consents or waivers hereto or hereunder, (d) any out-of-pocket
          fees, costs, expenses and bank charges, including bank charges
          for returned checks and wire transfer charges, incurred by the
          Bank in establishing, maintaining or handling of any lock box
          accounts, cash collateral accounts and other accounts for the
          collection of any of the Collateral which are required under the
          Loan Documents or established with the consent of any Borrower;
          (e) subject to the provisions of Section 9.9.1 and 9.9.2, all
          reasonable fees, expenses and disbursements (including without
          limitation reasonable attorneys' fees and costs, which attorneys
          may be employees of the Bank, and reasonable consulting,
          accounting, auditing (including the cost of the Bank's initial
          audit and any future audits that the Bank deems necessary))
          examination, commercial finance examination, preparation of
          collateral reports, appraisal, investment banking and similar
          professional fees and charges) incurred by the Bank in connection
          with (i) the preparation, negotiation, execution, amendment,
          modification, administration or interpretation of the Loan
          Documents and other instruments mentioned herein (ii) the
          enforcement of or preservation of rights under any of the Loan
          Documents against any of the Borrowers or the administration
          thereof after the occurrence of a Default or Event of Default and
          (iii) any litigation, proceeding or dispute whether arising
          hereunder or otherwise, in any way related to the Bank's
          relationship with any of the Borrowers and (f) all reasonable
          fees, expenses and disbursements of the Bank incurred in
          connection with UCC searches, UCC filings, or other filings or
          recordations relating to the Collateral.  The covenants of this
          Section 15.1 shall survive payment or satisfaction of all other
          NPDC Obligations and GPC Obligations.

                    Section 15.2.  Indemnification.  (a) NPDC agrees to
          indemnify and hold harmless the Bank and each of its affiliates,
          officers, directors, employees, agents and advisors (each an
          "Indemnified Party") from and against any and all claims,
          actions, investigations and suits whether groundless or
          otherwise, and from and against any and all liabilities, losses,
          damages and expenses of every nature and character arising out of
          this Credit Agreement or any of the other Loan Documents or the
          transactions contemplated hereby in each case with respect to the
          Term Loan or NPDC including, without limitation, (i) any actual
          or proposed use by NPDC respectively, of the proceeds of any of
          the Loans (ii) the reversal or withdrawal of any provisional
          credits granted by the Bank upon the transfer of funds from
          accounts or in connection with the provisional honoring of checks
          or other items, (iii) NPDC entering into or performing this
          Credit Agreement or any of the other Loan Documents or (iv) with

          respect to NPDC and its properties and assets, the violation of
          any Environmental Law, the presence, disposal, escape, seepage,
          leakage, spillage, discharge, emission, release or threatened
          release of any Hazardous Substances or any action, suit,
          proceeding or investigation brought or threatened with respect to
          any Hazardous Substances (including, but not limited to, claim
          with respect to wrongful death, personal injury or damage to
          property), in each case including, without limitation, the
          reasonable fees and disbursements of counsel and the direct and
          reasonable costs of internal counsel incurred in connection with
          any such investigation, litigation or other proceeding; provided,
          that NPDC shall have no obligation hereunder to the Bank with
          respect to indemnified liabilities arising from the gross
          negligence or willful misconduct of the Bank.  In litigation, or
          the preparation therefor, each Indemnified Party shall be
          entitled to select its own counsel and, in addition to the
          foregoing indemnity, NPDC agrees to pay promptly the reasonable
          fees and expenses of such counsel.  If, and to the extent that
          the obligations of NPDC under this Section 15.2 are unenforceable
          for any reason, NPDC hereby agrees to make the maximum
          contribution to the payment in satisfaction of such obligations
          that is permissible under Applicable Law.  The covenants
          contained in this Section 15.2 shall survive payment or
          satisfaction in full of all other NPDC Obligations.

               (b) The GPC Borrowers jointly and severally agree to
          indemnify and hold harmless the Bank and each of its affiliates,
          officers, directors, employees, agents and advisors (each an
          "Indemnified Party") from and against any and all claims,
          actions, investigations and suits whether groundless or
          otherwise, and from and against any and all liabilities, losses,
          damages and expenses of every nature and character arising out of
          this Credit Agreement or any of the other Loan Documents or the
          transactions contemplated hereby in each case with respect to 
          the Revolving Credit Loans, the Letters of Credit or any GPC
          Borrower, including, without limitation, (i) any actual or
          proposed use by the GPC Borrowers of the proceeds of any of the
          Loans or Letters of Credit, (ii) the reversal or withdrawal of
          any provisional credits granted by the Bank upon the transfer of
          funds from accounts or in connection with the provisional
          honoring of checks or other items, (iii) any of the GPC Borrowers
          entering into or performing this Credit Agreement or any of the
          other Loan Documents or (iv) with respect to the GPC Borrowers
          and their properties and assets, the violation of any
          Environmental Law, the presence, disposal, escape, seepage,
          leakage, spillage, discharge, emission, release or threatened
          release of any Hazardous Substances or any action, suit,
          proceeding or investigation brought or threatened with respect to
          any Hazardous Substances (including, but not limited to, claim
          with respect to wrongful death, personal injury or damage to
          property), in each case including, without limitation, the
          reasonable fees and disbursements of counsel and the direct and
          reasonable costs of internal counsel incurred in connection with
          any such investigation, litigation or other proceeding; provided,
          that the GPC Borrowers shall have no obligation hereunder to the
          Bank with respect to indemnified liabilities arising from the
          gross negligence or willful misconduct of the Bank.  In
          litigation, or the preparation therefor, each Indemnified Party
          shall be entitled to select its own counsel and, in addition to
          the foregoing indemnity, the GPC Borrowers, jointly and
          severally, agree to pay promptly the reasonable fees and expenses
          of such counsel.  If, and to the extent that the obligations of
          any of the GPC Borrowers under this Section 15.2 are
          unenforceable for any reason, such GPC Borrower hereby agrees to
          make the maximum contribution to the payment in satisfaction of
          such obligations that is permissible under Applicable Law.  The
          covenants contained in this Section 15.2 shall survive payment or
          satisfaction in full of all other GPC Obligations.

                    Section 15.3.  Survival of Covenants, Etc.  All
          covenants, agreements, representations and warranties made by (a)
          NPDC or (b) the GPC Borrowers, respectively, herein, in the Term
          Note, in any of the other Loan Documents or in any documents or
          other papers delivered by or on behalf of any of such respective
          Borrowers pursuant hereto shall be deemed to have been relied
          upon by the Bank, notwithstanding any investigation heretofore or
          hereafter made by any of them, and (i) in the case of NPDC, shall
          survive the making by the Bank of the Term Loan as herein
          contemplated, and shall continue in full force and effect so long
          as any amount due from NPDC under this Credit Agreement or the
          Term Note or any of the other Loan Documents remains outstanding
          and for such further time as may be otherwise expressly specified
          in this Credit Agreement and (ii) in the case of the GPC
          Borrowers, shall survive the making by the Bank of any of the
          Revolving Credit Loans and the issuance, extension or renewal of
          any Letters of Credit, as herein contemplated, and shall continue
          in full force and effect so long as any Letter of Credit or
          amount due by any GPC Borrower under this Credit Agreement or any
          Revolving Credit Note or any of the other Loan Documents remains
          outstanding or the Bank has any obligation to make any Revolving
          Credit Loans or to issue, extend or renew any Letter of Credit,
          and for such further time as may be otherwise expressly specified
          in this Credit Agreement.  All statements contained in any
          certificate or other paper delivered to the Bank at any time by
          or on behalf of any of the Borrowers pursuant hereto shall
          constitute representations and warranties by such Borrower
          hereunder.

                    Section 15.4.  Assignment and Participation.  

                         15.4.1.  No Assignments by Borrowers.  None of the
          Borrowers shall assign or transfer any of its rights or
          obligations under any of the Loan Documents without the prior
          written consent of the Bank.

                         15.4.2.  Assignments and Participations.  The Bank
          may sell assignments with the consent of the Borrowers, which
          will not be unreasonably withheld, or participations to one or
          more banks or other entities in all or a portion of the Bank's
          rights and obligations under this Credit Agreement and the other
          Loan Documents; provided, that (a) each such assignment or
          participation shall be in an amount of not less than $5,000,000,
          (b) any such sale of a participation shall not affect the rights
          and duties of the Bank hereunder to the Borrowers and the
          Borrowers shall continue to deal solely and directly with the
          Bank in connection therewith, (c) the only rights granted to a
          participant pursuant to any such participation arrangements with
          respect to waivers, amendments or modifications of the Loan
          Documents shall be the rights to approve waivers, amendments or
          modifications that would reduce the principal of or the interest
          rate on any Loans, extend the term or increase the amount of the
          Revolving Credit Commitment of the Bank as it relates to such
          participant, reduce the amount of any commitment fees or Letter
          of Credit Fees to which such participant is entitled or extend
          any regularly scheduled payment date for principal or interest
          and (d) no participant shall be entitled to receive any greater
          amount pursuant to Section 5.5.4, 5.5.5 or 5.6.1.2 than the Bank
          would have been entitled to receive in respect of the amount of
          the participation transferred by the Bank had no such transfer
          occurred.

                         15.4.3.  Disclosure.  The Borrowers agree that in
          addition to disclosures made in accordance with standard and
          customary banking practices the Bank may disclose information
          obtained by the Bank pursuant to this Credit Agreement to
          assignees, participants, potential assignees and potential
          participants hereunder; provided, that such assignees,
          participants, potential assignees or potential participants shall
          agree (a) to treat in confidence such information unless such
          information otherwise becomes public knowledge, (b) not to
          disclose such information to a third party, except as required by
          law or legal process and (c) not to make use of such information
          for purposes of transactions unrelated to such contemplated
          assignment or participation.

                    Section 15.5.  Notices, Etc.  Except as otherwise
          expressly provided in this Credit Agreement, all notices and
          other communications made or required to be given pursuant to
          this Credit Agreement or the Term Note or the Revolving Credit
          Note or any Letter of Credit Applications shall be in writing and
          shall be delivered in hand, mailed by United States registered or
          certified first class mail, postage prepaid, sent by nationally
          recognized overnight delivery service, or sent by facsimile and
          confirmed by delivery via nationally recognized overnight
          delivery service or postal service, addressed as follows:

                    (a)  if to the GPC Borrowers, at 6700 Alexander Bell
          Drive, Columbia, Maryland 21046, Attention:  John C. McAuliffe,
          Executive Vice President and Chief Financial Officer (facsimile
          410-290-2646), or at such other address for notice as the
          Borrowers shall last have furnished in writing to the Person
          giving the notice; and

                    (b)  if to NPDC, at 9 West 57th St., Suite 4170, New
          York, New York 10019, Attn:  General Counsel (facsimile
          212-230-9545), or such other address for notice as the Bank shall
          last
          have furnished in writing to the Person giving notice.

                    (c)  if to the Bank, at Exchange Place Centre, 10
          Exchange Place, Jersey City, New Jersey 07302, Attention: Phillip
          H. Sorace, Vice President (facsimile 212-703-1724), or such other
          address for notice as the Bank shall last have furnished in
          writing to the Person giving the notice.

                    Any such notice or demand shall be deemed to have been
          duly given or made and to have became effective (i) if delivered
          by hand or nationally recognized overnight delivery service to a
          responsible officer of the party to which it is directed, at the
          time of the receipt thereof by such officer, (ii) if delivered by
          facsimile, at the time of the sending of such facsimile (receipt
          of which shall be confirmed by telephonic or electronic means)
          and (iii) if sent by registered or certified first-class mail,
          postage prepaid, on the third Business Day following the mailing
          thereof.

                    Section 15.6.  Governing Law; Jurisdiction and Venue. 
          THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF ALL PARTIES
          HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED AND INTERPRETED IN
          ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

                    Each Borrower hereby irrevocably and unconditionally:

                         (a)  submits for itself and its property in any
               legal action or proceeding relating to this Credit Agreement
               and the other Loan Documents to which it is a party, or for
               recognition and enforcement of any judgement in respect
               thereof, to the non-exclusive general jurisdiction of the
               Courts of the State of New York, the courts of the
               United States of America for the Southern District of
               New York, and appellate courts from any thereof;

                         (b)  consents that any such action or proceeding
               may be brought in such courts and waives any objection that
               it may now or hereafter have to the venue of any such action
               or proceeding in any such court or that such action or
               proceeding was brought in an inconvenient court and agrees
               not to plead or claim the same;

                         (c)  agrees that service of process in any such
               action or proceeding may be effected by mailing a copy
               thereof by registered or certified mail (or any
               substantially similar form of mail), postage prepaid, to
               such Borrower at its address set forth in Section 15.5 or at
               such other address of which the Bank shall have been
               notified pursuant thereto; and 

                          (d)  agrees that nothing herein shall affect the
               right to effect service of process in any other manner
               permitted by law or shall limit the right to sue in any
               other jurisdiction.

                    Section 15.7.  Acknowledgements.  Each Borrower hereby
          acknowledges that:

                    (a)  it has been advised by counsel in the negotiation,
               execution and delivery of this Credit Agreement and the
               other Loan Documents;

                    (b)  the Bank does not have any fiduciary relationship
               with or fiduciary duty to any Borrower arising out of or in
               connection with this Credit Agreement or any of the other
               Loan Documents, and the relationship between the Bank and
               each Borrower in connection herewith or therewith is solely
               that of debtor and creditor; and

                    (c)  no joint venture is created hereby or by the other
               Loan Documents or otherwise exists by virtue of the
               transactions contemplated hereby among any Borrower and the
               Bank.

                    Section 15.8.  WAIVER OF JURY TRIAL.  AS A SPECIFICALLY
          BARGAINED INDUCEMENT FOR THE BANK TO EXTEND CREDIT TO EACH
          BORROWER, AND AFTER HAVING THE OPPORTUNITY TO CONSULT COUNSEL,
          THE BORROWERS HEREBY EXPRESSLY WAIVE THE RIGHT TO TRIAL BY JURY
          IN ANY LAWSUIT OR PROCEEDING RELATING TO THIS CREDIT AGREEMENT OR
          ARISING IN ANY WAY FROM THE NPDC OBLIGATIONS OR THE GPC
          OBLIGATIONS.

                    Section 15.9.  Headings.  The captions in this Credit
          Agreement are for convenience of reference only and shall not
          define or limit the provisions hereof.

                    Section 15.10.  Counterparts.  This Credit Agreement
          and any amendment hereof may be executed in several counterparts
          and by each party on a separate counterpart, each of which when
          executed and delivered shall be an original, and all of which
          together shall constitute one instrument.  In proving this Credit
          Agreement it shall not be necessary to produce or account for
          more than one such counterpart signed by the party against whom
          enforcement is sought.

                    Section 15.11.  Entire Agreement, Etc.  The Loan
          Documents and any other documents executed in connection herewith
          or therewith express the entire understanding of the parties with
          respect to the transactions contemplated hereby.  Neither this
          Credit Agreement nor any term hereof may be changed, waived,
          discharged or terminated, except as provided in Section 15.11.

                    Section 15.12.  Consents, Amendments, Waivers, Etc. 
          Any consent or approval required or permitted by this Credit
          Agreement to be given by the Bank may be given, and any term of
          this Credit Agreement, the other Loan Documents or any other
          instrument related hereto or mentioned herein may be amended, and
          the performance or observance by any of the Borrowers of any
          terms of this Credit Agreement, the other Loan Documents or such
          other instrument or the continuance of any Default or Event of
          Default may be waived (either generally or in a particular
          instance and either retroactively or prospectively) with, but
          only with, the written consent of each of the Borrowers and the
          written consent of the Bank.  No waiver shall extend to or affect
          any right or obligation not expressly waived.  No course of
          dealing or delay or omission on the part of the Bank in
          exercising any right shall operate as a waiver thereof or
          otherwise be prejudicial thereto.  No notice to or demand upon
          any of the Borrowers shall entitle any of the Borrowers to other
          or further notice or demand in similar or other circumstances.

                    Section 15.13.  Severability.  The provisions of this
          Credit Agreement are severable and if any one clause or provision
          hereof shall be held invalid or unenforceable in whole or in part
          in any jurisdiction, then such invalidity or unenforceability
          shall affect only such clause or provision, or part thereof, in
          such jurisdiction, and shall not in any manner affect such clause
          or provision in any other jurisdiction, or any other clause or
          provision of this Credit Agreement in any jurisdiction.

                    Section 15.14.  Integration of Exhibits and Schedules. 
          Annexed to this Credit Agreement are Exhibits A-1 through J and
          Schedules 8.2 through 11.2.  Such Exhibits and Schedules are an
          integral part of this Credit Agreement and are hereby
          incorporated by reference.

                    Section 15.15.  Confidentiality.  The Bank agrees to
          use reasonable precautions to keep confidential, in accordance
          with its customary procedures for handling confidential
          information of this nature and in accordance with safe and sound
          banking practices, any non-public information supplied to it by
          any Borrower pursuant to this Credit Agreement which is
          identified by such Borrower as being confidential at the time the
          same is delivered to the Bank, provided, that nothing herein
          shall limit the disclosure of any such information (i) to the
          extent required by statute, rule, regulation or judicial process,
          (ii) to counsel to the Bank, (iii) to bank examiners, auditors or
          accountants, (iv) in connection with any litigation to which the
          Bank is a party or (v) to any assignee or participant (or
          prospective assignee or participant) so long as such assignee or
          participant (or prospective assignee or participant) is notified
          of the confidentiality provisions in this Section 15.15.  In no
          event shall the Bank be obligated or required to return any
          materials furnished by any Borrower.

                IN WITNESS WHEREOF, the undersigned have duly executed this
          Credit Agreement as of the date first set forth above.

                                        NATIONAL PATENT DEVELOPMENT        

                                          CORPORATION
                                        
                                        
                                        By: Lawrence M. Gordon             
                                            Vice President
                                           
                                        
                                        
                                        GENERAL PHYSICS CORPORATION
                                        
                                        
                                        By: John V. Moran  
                                            Senior Vice President
                                                                               
                                        
                                        INVENTORY MANAGEMENT CORPORATION
                                        
                                        
                                        By: John C. McAuliffe  
                                            Vice President
                                                                             
                                        
                                        GP ENVIRONMENTAL SERVICES, INC.
                                        
                                        
                                        By: Robert Danna  
                                            President               
                                        
                                        
                                        GPS TECHNOLOGIES, INC. FEDERAL
                                        SYSTEMS GROUP
                                        
                                        
                                        By:  John C. McAuliffe
                                             Treasurer
                                      
                                        
                                        
                                        NATWEST BANK N.A.
                                        
                                        
                                        By: Phillip H. Sorace  
                                            Vice President
                                           Title: